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初中英语冀教版八年级下册Lesson 38 The World Is a Big Place评课课件ppt
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这是一份初中英语冀教版八年级下册Lesson 38 The World Is a Big Place评课课件ppt，文件包含Lesson38pptx、Unit7第2课时DOC、L38单词mp3、L38课文朗读mp3等4份课件配套教学资源，其中PPT共46页， 欢迎下载使用。
Learning Targets
Key wrds & phrases:planet, billin, ttal, increase, surface, Indian, Atlantic, Arctic, in ttal, ne third, be cvered with…, tw thirdsKey sentences:1. Can yu pint them ut? 2. The earth is a very special planet, and it faces a big prblem.
3. In the year 2010, the wrld’s ppulatin was ver 7 billin in ttal.4. It is increasing very quickly. 5. And by 2050, the wrld’s ppulatin may reach 9 billin. 6. We can’t live in water, and nly abut ne third f ur planet is land.
7. Antarctica is cvered with snw and ice all year rund. 8. The earth is ur hme nw，and it will be ur hme in the future. 9. It has the highest pint n the earth in the Himalayas.Grammar: passive vice
What prblems the earth faces?
Ppulatin prblems
Envirnmental pllutin
Exhausted resurce
planet billin ttal increase surface Indian
n. 总计；总数 adj. 总的；总计的
adj. 印度的 n. 印度人
Wrds and expressins
Atlantic Arctic in ttalne thirdbe cvered with… tw thirds
总计，合计，总共三分之一被……覆盖三分之二
n. & adj. 太西洋（的）
Hw many cntinents are there in the wrld? What are they?What d yu knw abut the place where yu live?
THINK ABOUT IT
Listen and read
Presentatin
The earth is a very special planet, and it faces a big prblem. In the year 2010, the wrld’s ppulatin was ver 7 billin in ttal. It is increasing very quickly. By 2025, the wrld may have abut 8 billin peple. And by 2050, the wrld’s ppulatin may reach 9 billin.
There is anther prblem. Peple can’t live everywhere n the earth. We can’t live in water, and nly abut ne third f ur planet is land. But parts f this land are very dry. These dry places are called deserts. Sme areas have very high muntains. Others have a lt f snw and ice. It is nt easy t live in thse places.
There are seven cntinents: Asia, Africa, Australia, Antarctica, Eurpe, Nrth America and Suth America. Antarctica is cvered with snw and ice all year rund. Luckily, peple can live n the ther six cntinents. On these cntinents, there are green frests, fresh water and rich lands.
Oceans cver tw thirds f the earth’s surface. The earth has nly ne big cean, but we use these names fr its different parts: the Pacific Ocean, the Indian Ocean, the Atlantic Ocean and the Arctic Ocean. The Pacific Ocean is the largest ne.The earth is ur hme nw, and it will be ur hme in the future. It must be treated well fr ur children and fr ur children’s children, t!
Let’s D It!
Read the lessn and match each paragraph with its main idea.
Paragraph 1 a. Six f the seven cntinents are Paragraph 2 b. We shuld treat the earth well.Paragraph 3 c. An increasing ppulatin is a bigParagraph 4 d. Tw thirds f the earth is cveredParagraph 5 e. Peple cannt live everywhere n
gd fr peple t live n.
prblem fr the earth.
with ceans.
Fill in the blanks with the crrect frms f the wrds in the bx.
1. The number f swimmers here is __________ quickly because it’s very ht these days.2. The schl has a __________ f 900 students.3. I think it may be the __________ seasn f the year.4. The __________ f ur bdy is skin. It prtects us.5. Hw many __________ f peple are there in the wrld nw?
increase dry surface billin ttal
Match the seven cntinents with their crrect descriptins.
It is the biggest cntinent. It has the highest pint n the earth in the Himalayas.
It is the secnd largest cntinent. Many elephants, giraffes, zebras and lins live there.
It is the third largest cntinent. Canada, Mexic and the U. S. are the three majr cuntries n this cntinent.
It is the furth largest cntinent. There are 13 cuntries n this cntinent.
It is the fifth largest cntinent. The Suth Ple is n this cntinent.
It is the sixth largest cntinent. It is a gd place fr peple t travel t.
It is the smallest cntinent. Yu can find kalas and kangars there.
Suth America
Nrth America
1. Can yu pint them ut? pint v．指，指向。常用短语：pint at指着；pint ut指出，说明。例：He pinted ut the dangers f driving alne. 他指出了单独开车的危险性。 Can yu pint ut the mistakes in this picture？ 你能指出这张图片中的错误吗？
Language pints
2. The earth is a very special planet, and it faces a big prblem. face v. 面临；面对。它在此作及物动词，后面可接人或表示困难、形势、问题等的抽象名词或动名词作宾语。例: Yu shuld face the challenge bravely. 你应该勇敢地面对挑战。
3. In the year 2010, the wrld’s ppulatin was ver 7 billin in ttal. (1) billin n．十亿。其复数形式为billins。当其前有具体的数词时，用单数形式，表示确数；当其前没有数词或由sme, several, many等词修饰时，用复数形式，且其后要接介词f，表示概数。类似用法的词还有hundred(百), thusand(千), millin(百万)等。
例: This cmpany earns tw billin dllars a year. 这家公司一年要赚20亿美元。 Billins f stars twinkled in the sky. 无数的星星在天空中闪烁。(2) in ttal意为“总计，合计，总共”, 相当于in all。 a ttal f … 总数为…… 例: His sister has three hundred stamps in ttal. 他的姐姐总共有三百张邮票。 Our class has a ttal f 60 students.我们班总共有60人。
4. It is increasing very quickly.increase v．增加；增大。例：The number f the students in ur schl is increasing. 我们学校学生的数量正在增长。
5. And by 2050, the wrld’s ppulatin may reach 9 billin.by 2025 意为“到2025年为止”。by在这里意为“到……为止”。例:Will yu finish it by 10:00 p.m.? 晚上十点前你能完成它吗？
6. We can’t live in water, and nly abut ne third f ur planet is land.ne third是分数，意思是“三分之一”。分数表达法：①分子用基数词，分母用序数词；当分子大于1的时候，分母使用复数形式。例：ne fifth 五分之一；ne furth 四分之一；three eighths 八分之三。
②特殊表达法。如：a half 二分之一；a quarter 四分之一；three quarters 四分之三。注意：当分数在句中作主语的时候，若后面的名词是复数，则谓语动词用复数；若后面的名词是单数或不可数名词，则谓语动词用单数。
Nwadays，________f the ld peple in the area ________ used t dancing n the square after supper. (湖北恩施州中考) A．tw third；is B．tw thirds；is C．tw thirds；are
解析 考查分数的用法和主谓一致。句意：如今这个地区三分之二的老年人已经习惯于晚饭后在广场上跳舞。 分数的表达法为：分子用基数词，分母用序数词；当分子大于1时，分母要用复数，排除A。当分数作主语时，其后的谓语动词与分数后面的名词保持一致。peple是复数名词，故用are。解题方法 语法判定法
7. Antarctica is cvered with snw and ice all year rund.(1) be cvered with 被……覆盖。 其主动结构为：cver…with…(用……盖住……)例：Our garden is cvered with grass and flwers. 我们的花园被花草覆盖着。 Please cver this desk with clth. 请用布盖住这张课桌。(2) all (the) year rund 全年，整年。
它相当于all ver the year。 例：Drunk driving is a prblem all year rund. 酒后驾车是个常年存在的问题。8. The earth is ur hme nw，and it will be ur hme in the future.辨析 in the future与in future ① in the future 将来，未来。它所表示的将来是指以后的将来，并不强调从说话的这一刻开始。
② in future 今后。它强调从说话时开始的以后，相当于frm nw n。9. It has the highest pint n the earth in the Himalayas.该句运用了形容词的最高级结构。定义：表示三者或三者以上的人或物进行比较时，用最高级。形容词的最高级前面要加定冠词the，副词最高级前面的the可以省略。
在含有最高级的句子中，常有一个in/f短语来表示比较范围。例: I am the tallest in ur class. 我是我们班里个子最高的。My mvements are the mst graceful f us three. 三个人中我的动作是最优雅的。
被动语态被动语态表示主语是谓语动作的承受者，一般说来，当强调动作承受者，不必说出执行者或执行者含糊不清时，多用被动语态。
1. These dry places are called deserts.2. Antarctica is cvered with snw and ice all year rund.3. It must be treated well fr ur children and fr ur children’s children, t!4. It’s prnunced like the letter “A”.
be + 过去分词（ be随着主语人称和数以及时态的不同而变化）can / must / may / shuld … + be + 过去分词（含有情态动词的被动语态）
一般现在时、一般过去时和一般将来时的主动结构和被动结构 (以动词d为例)
主动语态变为被动语态一般现在时：主：We believe him.被：He is believed by us.一般过去时：主：He bught his children sme pens.被：Sme pens were bught fr his children by him.一般将来时：主：Everyne will knw the truth sn .被：The truth will be knwn by everyne.
将下列主动句变为被动句：1. 人们认为他很有才华。主动: Peple regard him as brilliant.被动:2.孩子们热烈地欢迎外宾。主动: The children gave the freign guests a warm welcme.被动：3. 他们将问你许多怪题。主动: They will ask yu a lt f strange questins.被动:
He is regarded as brilliant by peple.
The freign guests were given a warm welcme by the children.
Yu will be asked a lt f strange questins by them.
1. We have a lvely rm. It’s ne f ____ in the htel. A. nice B. nicer C. nicest D. the nicest ____ f the students are frm the cuntryside. A. Third quarter B. Three quarters C. Three quarter D. Third quarters
3. —Wh has ____ marks in English, Wang Lin, Zhang Fang r Li Hng? —Li Hng． A. gd B. better C. best D. the best 4. Hng Kng _____ t be a gd place fr eating tday. A. knws B. knew C. is knwn D. was knwn
5. Nick _______ a jb in a bank, but t ur surprise, he didn’t take it. A. ffered B. has ffered C. was ffered D. ffers6. — Have yu heard f Earth Day? — Yes. The first Earth Day _______ in 1970 t educate us t prtect ur planet. A. celebrates B. celebrated C. is celebrated D. was celebrated
7. Mre mney ________ when we use bth sides f paper. A. will save B. was saved C. has saved D. will be saved8. A new club ________ in ur schl at the beginning f this year and nw it has many members. A. starts B. is started C. has started D. was started
9. — Our classrm ________ every day. — S it is. It’s ur duty t keep it clean and tidy. A. cleans B. is cleaning C. is cleaned D. has been cleaned10. — Sixteen-year-lds ________ t drive in China. — But in America, they can. A. is allwed B. is nt allwed C. are allwed D. are nt allwed
二、根据首字母及汉语提示完成句子
The number f turists has i________ greatly in recent years. The s______ f the lake is quite still. The film will be ver _____ 9:30. They claimed t have discvered a new p_____. _____ _____ _____ (四分之一) the students have left their pictures hme.
A quarter f
6. The plan wuld save _________(数十亿) dllars in fuels each year.7. ________ (总共), 98% f all cmputer users are nw nline. 8. The sea cvers almst _______ _______ (四分之三) f the earth's surface. 9. The Nile River is the _______ river in Africa.10. Antarctica is the wrld’s _____ (最干旱的) cntinent.
three furths
1. Learn sme new wrds and expressins.2. Review the present perfect tense3. Master the passive vice.
Learning Targets
Key wrds & phrases:planet, billin, ttal, increase, surface, Indian, Atlantic, Arctic, in ttal, ne third, be cvered with…, tw thirdsKey sentences:1. Can yu pint them ut? 2. The earth is a very special planet, and it faces a big prblem.
3. In the year 2010, the wrld’s ppulatin was ver 7 billin in ttal.4. It is increasing very quickly. 5. And by 2050, the wrld’s ppulatin may reach 9 billin. 6. We can’t live in water, and nly abut ne third f ur planet is land.
7. Antarctica is cvered with snw and ice all year rund. 8. The earth is ur hme nw，and it will be ur hme in the future. 9. It has the highest pint n the earth in the Himalayas.Grammar: passive vice
What prblems the earth faces?
Ppulatin prblems
Envirnmental pllutin
Exhausted resurce
planet billin ttal increase surface Indian
n. 总计；总数 adj. 总的；总计的
adj. 印度的 n. 印度人
Wrds and expressins
Atlantic Arctic in ttalne thirdbe cvered with… tw thirds
总计，合计，总共三分之一被……覆盖三分之二
n. & adj. 太西洋（的）
Hw many cntinents are there in the wrld? What are they?What d yu knw abut the place where yu live?
THINK ABOUT IT
Listen and read
Presentatin
The earth is a very special planet, and it faces a big prblem. In the year 2010, the wrld’s ppulatin was ver 7 billin in ttal. It is increasing very quickly. By 2025, the wrld may have abut 8 billin peple. And by 2050, the wrld’s ppulatin may reach 9 billin.
There is anther prblem. Peple can’t live everywhere n the earth. We can’t live in water, and nly abut ne third f ur planet is land. But parts f this land are very dry. These dry places are called deserts. Sme areas have very high muntains. Others have a lt f snw and ice. It is nt easy t live in thse places.
There are seven cntinents: Asia, Africa, Australia, Antarctica, Eurpe, Nrth America and Suth America. Antarctica is cvered with snw and ice all year rund. Luckily, peple can live n the ther six cntinents. On these cntinents, there are green frests, fresh water and rich lands.
Oceans cver tw thirds f the earth’s surface. The earth has nly ne big cean, but we use these names fr its different parts: the Pacific Ocean, the Indian Ocean, the Atlantic Ocean and the Arctic Ocean. The Pacific Ocean is the largest ne.The earth is ur hme nw, and it will be ur hme in the future. It must be treated well fr ur children and fr ur children’s children, t!
Let’s D It!
Read the lessn and match each paragraph with its main idea.
Paragraph 1 a. Six f the seven cntinents are Paragraph 2 b. We shuld treat the earth well.Paragraph 3 c. An increasing ppulatin is a bigParagraph 4 d. Tw thirds f the earth is cveredParagraph 5 e. Peple cannt live everywhere n
gd fr peple t live n.
prblem fr the earth.
with ceans.
Fill in the blanks with the crrect frms f the wrds in the bx.
1. The number f swimmers here is __________ quickly because it’s very ht these days.2. The schl has a __________ f 900 students.3. I think it may be the __________ seasn f the year.4. The __________ f ur bdy is skin. It prtects us.5. Hw many __________ f peple are there in the wrld nw?
increase dry surface billin ttal
Match the seven cntinents with their crrect descriptins.
It is the biggest cntinent. It has the highest pint n the earth in the Himalayas.
It is the secnd largest cntinent. Many elephants, giraffes, zebras and lins live there.
It is the third largest cntinent. Canada, Mexic and the U. S. are the three majr cuntries n this cntinent.
It is the furth largest cntinent. There are 13 cuntries n this cntinent.
It is the fifth largest cntinent. The Suth Ple is n this cntinent.
It is the sixth largest cntinent. It is a gd place fr peple t travel t.
It is the smallest cntinent. Yu can find kalas and kangars there.
Suth America
Nrth America
1. Can yu pint them ut? pint v．指，指向。常用短语：pint at指着；pint ut指出，说明。例：He pinted ut the dangers f driving alne. 他指出了单独开车的危险性。 Can yu pint ut the mistakes in this picture？ 你能指出这张图片中的错误吗？
Language pints
2. The earth is a very special planet, and it faces a big prblem. face v. 面临；面对。它在此作及物动词，后面可接人或表示困难、形势、问题等的抽象名词或动名词作宾语。例: Yu shuld face the challenge bravely. 你应该勇敢地面对挑战。
3. In the year 2010, the wrld’s ppulatin was ver 7 billin in ttal. (1) billin n．十亿。其复数形式为billins。当其前有具体的数词时，用单数形式，表示确数；当其前没有数词或由sme, several, many等词修饰时，用复数形式，且其后要接介词f，表示概数。类似用法的词还有hundred(百), thusand(千), millin(百万)等。
例: This cmpany earns tw billin dllars a year. 这家公司一年要赚20亿美元。 Billins f stars twinkled in the sky. 无数的星星在天空中闪烁。(2) in ttal意为“总计，合计，总共”, 相当于in all。 a ttal f … 总数为…… 例: His sister has three hundred stamps in ttal. 他的姐姐总共有三百张邮票。 Our class has a ttal f 60 students.我们班总共有60人。
4. It is increasing very quickly.increase v．增加；增大。例：The number f the students in ur schl is increasing. 我们学校学生的数量正在增长。
5. And by 2050, the wrld’s ppulatin may reach 9 billin.by 2025 意为“到2025年为止”。by在这里意为“到……为止”。例:Will yu finish it by 10:00 p.m.? 晚上十点前你能完成它吗？
6. We can’t live in water, and nly abut ne third f ur planet is land.ne third是分数，意思是“三分之一”。分数表达法：①分子用基数词，分母用序数词；当分子大于1的时候，分母使用复数形式。例：ne fifth 五分之一；ne furth 四分之一；three eighths 八分之三。
②特殊表达法。如：a half 二分之一；a quarter 四分之一；three quarters 四分之三。注意：当分数在句中作主语的时候，若后面的名词是复数，则谓语动词用复数；若后面的名词是单数或不可数名词，则谓语动词用单数。
Nwadays，________f the ld peple in the area ________ used t dancing n the square after supper. (湖北恩施州中考) A．tw third；is B．tw thirds；is C．tw thirds；are
解析 考查分数的用法和主谓一致。句意：如今这个地区三分之二的老年人已经习惯于晚饭后在广场上跳舞。 分数的表达法为：分子用基数词，分母用序数词；当分子大于1时，分母要用复数，排除A。当分数作主语时，其后的谓语动词与分数后面的名词保持一致。peple是复数名词，故用are。解题方法 语法判定法
7. Antarctica is cvered with snw and ice all year rund.(1) be cvered with 被……覆盖。 其主动结构为：cver…with…(用……盖住……)例：Our garden is cvered with grass and flwers. 我们的花园被花草覆盖着。 Please cver this desk with clth. 请用布盖住这张课桌。(2) all (the) year rund 全年，整年。
它相当于all ver the year。 例：Drunk driving is a prblem all year rund. 酒后驾车是个常年存在的问题。8. The earth is ur hme nw，and it will be ur hme in the future.辨析 in the future与in future ① in the future 将来，未来。它所表示的将来是指以后的将来，并不强调从说话的这一刻开始。
② in future 今后。它强调从说话时开始的以后，相当于frm nw n。9. It has the highest pint n the earth in the Himalayas.该句运用了形容词的最高级结构。定义：表示三者或三者以上的人或物进行比较时，用最高级。形容词的最高级前面要加定冠词the，副词最高级前面的the可以省略。
在含有最高级的句子中，常有一个in/f短语来表示比较范围。例: I am the tallest in ur class. 我是我们班里个子最高的。My mvements are the mst graceful f us three. 三个人中我的动作是最优雅的。
被动语态被动语态表示主语是谓语动作的承受者，一般说来，当强调动作承受者，不必说出执行者或执行者含糊不清时，多用被动语态。
1. These dry places are called deserts.2. Antarctica is cvered with snw and ice all year rund.3. It must be treated well fr ur children and fr ur children’s children, t!4. It’s prnunced like the letter “A”.
be + 过去分词（ be随着主语人称和数以及时态的不同而变化）can / must / may / shuld … + be + 过去分词（含有情态动词的被动语态）
一般现在时、一般过去时和一般将来时的主动结构和被动结构 (以动词d为例)
主动语态变为被动语态一般现在时：主：We believe him.被：He is believed by us.一般过去时：主：He bught his children sme pens.被：Sme pens were bught fr his children by him.一般将来时：主：Everyne will knw the truth sn .被：The truth will be knwn by everyne.
将下列主动句变为被动句：1. 人们认为他很有才华。主动: Peple regard him as brilliant.被动:2.孩子们热烈地欢迎外宾。主动: The children gave the freign guests a warm welcme.被动：3. 他们将问你许多怪题。主动: They will ask yu a lt f strange questins.被动:
He is regarded as brilliant by peple.
The freign guests were given a warm welcme by the children.
Yu will be asked a lt f strange questins by them.
1. We have a lvely rm. It’s ne f ____ in the htel. A. nice B. nicer C. nicest D. the nicest ____ f the students are frm the cuntryside. A. Third quarter B. Three quarters C. Three quarter D. Third quarters
3. —Wh has ____ marks in English, Wang Lin, Zhang Fang r Li Hng? —Li Hng． A. gd B. better C. best D. the best 4. Hng Kng _____ t be a gd place fr eating tday. A. knws B. knew C. is knwn D. was knwn
5. Nick _______ a jb in a bank, but t ur surprise, he didn’t take it. A. ffered B. has ffered C. was ffered D. ffers6. — Have yu heard f Earth Day? — Yes. The first Earth Day _______ in 1970 t educate us t prtect ur planet. A. celebrates B. celebrated C. is celebrated D. was celebrated
7. Mre mney ________ when we use bth sides f paper. A. will save B. was saved C. has saved D. will be saved8. A new club ________ in ur schl at the beginning f this year and nw it has many members. A. starts B. is started C. has started D. was started
9. — Our classrm ________ every day. — S it is. It’s ur duty t keep it clean and tidy. A. cleans B. is cleaning C. is cleaned D. has been cleaned10. — Sixteen-year-lds ________ t drive in China. — But in America, they can. A. is allwed B. is nt allwed C. are allwed D. are nt allwed
二、根据首字母及汉语提示完成句子
The number f turists has i________ greatly in recent years. The s______ f the lake is quite still. The film will be ver _____ 9:30. They claimed t have discvered a new p_____. _____ _____ _____ (四分之一) the students have left their pictures hme.
A quarter f
6. The plan wuld save _________(数十亿) dllars in fuels each year.7. ________ (总共), 98% f all cmputer users are nw nline. 8. The sea cvers almst _______ _______ (四分之三) f the earth's surface. 9. The Nile River is the _______ river in Africa.10. Antarctica is the wrld’s _____ (最干旱的) cntinent.
three furths
1. Learn sme new wrds and expressins.2. Review the present perfect tense3. Master the passive vice.
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