高中外研版 (2019)Unit 5 Revealing nature多媒体教学ppt课件

这是一份高中外研版 (2019)Unit 5 Revealing nature多媒体教学ppt课件，共27页。
Unit 5 Revealing nature
Obtain key infrmatin by lcating the key wrds and sentences;Guess the meaning f new wrds frm the cntext and prvided pictures;Read and think critically, giving mre talks n the tpic;Vice their pinin f the imprtance f seed travel t the plants;Develp the awareness f knwing nature.
1. the small hard part prduced by a plant, frm which a new plant can grw 2. t meet sb. r discver r experience sth.3. separated in space r cming frm r ging t a distance
Match the wrds with the definitins.
encunter ancestr seed evlve evlutin distant
4. smene frm whm yu are descended (but usually mre remte than a grandparent) 5. underg develpment r evlutin 6. ( bilgy ) the sequence f events invlved in the evlutinary develpment f a species r taxnmic grup f rganisms.
D yu like animals? Can yu name the fllwing animals in English? D yu knw what situatin these animals have in cmmn?
Tibetan antelpe
What unusual animals d yu knw abut?
Revealing nature
What d yu expect frm the title? Hw much d yu knw abut nature?
Man selects nly fr his wn gd; nature nly fr that f the being which she tends. ---- Charles Darwin
Lk deep int the nature, and then yu will understand everything better. ---- Albert Einstein
reveal: t make knwn smething that was previusly secret r unknwn
Lk at the page frm a science magazine and answer the questins.
1. What d yu knw abut these animals? What makes them special?
Kmd dragns were first encuntered by Western researchers in 1910. The researchers said the ancestr f the Kmd dragn mst likely evlved in Australia and spread westward, reaching the Indnesian island f Flres 900,000 years ag.
The Kmd dragn is the largest lizard in the wrld. It can grw t three metres in length and can weigh abut 135 kilgrams. Despite its size and weight, it can run fr shrt distances at up t 20 kilmetres per hur.
The first scientists t examine a preserved platypus bdy judged it a fake in the late 18th century.The ldest discvered fssil f the mdern platypus dates back t abut 100,000 years ag.
Duck-billed platypus
The duck-billed platypus is a small egg-laying mammal (up t 60 cm in length) fund nly in Eastern Australia including Tasmania. As its name suggests, it has a muth that lks like a duck’s bill, while its thick fur and flat tail are similar t thse f a beaver.
Fssil recrds indicate that the nautilus has survived relatively unchanged fr arund 500 millin years. It is ften cnsidered a “living fssil”.
As ne f the ldest sea animals in the wrld, the nautilus has hardly changed in abut 500 millin years, and that is why it is ften given the name “living fssil”.
2. What ther similar animals d yu knw abut? Share yur knwledge with the class.
Glden mnkey
Giant trtise
1. Hw can seeds travel? Hw can this benefit plants?2. Can yu think f anther example f seeds travelling? Share it with the class.
Watch the vide and answer the questins.
Hw can seeds travel? Hw can this benefit plants?2. Can yu think f anther example f seeds travelling? Share it with the class.
Seed usually are carried by the wind, water, and animals.Plants can have a better chance at life.
After-viewing
Seeds Traveling
① by itself
② by the wind
③ by the water
⑤ by the animals
⑥ by the insects
④ by the birds
The ldest discvered fssil f the mdern platypus dates back t abut 100,000 years ag.
date back t:  If smething dates back t a particular time, it started r was made at that time. 追溯（到）；开始（于）= date frm
常用一般现在时态，不用进行时态，也不用被动语态，后常跟过去的时间，如：……世纪、……年代、过去的年份等
eg The custm dates back hundreds f years. The beautiful flk legend dates back mre than 300 years.
date back后面加一段时间， “始于……（世纪、年、月、天等）前
【拓展】ut f date  过时的，陈旧的，不再流行的up t date  时新的，现代的set a date fr  为……定日期
Cllect sme infrmatin abut Darwin.