初中人教版（2024）Unit 1 Animal friends课前预习课件ppt

这是一份初中人教版（2024）Unit 1 Animal friends课前预习课件ppt，共13页。PPT课件主要包含了Objectives，Body，Ability，slowly，kind，same，spends，Its，but，teeth等内容，欢迎下载使用。
knw sme amazing things abut ctpusesdraw a mind map f amazing things abut ctpuses knw sme amazing things abut ther animalsknw sme amazing things abut snailsd sme exercise abut snails
Amng the many amazing animals in the wrld, few are as strange and unusual as the ctpus. There are arund 300 different kinds f ctpuses, and they cme in all sizes! The smallest is nly arund 2.5 centimetres lng, but sme ctpuses can grw up t mre than five metres lng. There was even an ctpus ver nine metres lng!
The Amazing Octpus
The ctpus's bdy is very interesting. All ctpuses have eight arms. Their brain is nt just in their head, but als in their arms! This helps them t think abut and d mre than ne thing at nce. Octpuses can als fit int small places because they d nt have any bnes! And did yu knw that ctpuses have three hearts? These hearts wrk with different parts f the bdy.Octpuses can als d many amazing things. They can change hw they lk. They can change their clur and shape t lk like plants r ther sea animals. Octpuses can als make ink.
They keep it inside very small bags in their bdy. When they prduce ink, the ink makes it hard fr ther animals t see them. This helps ctpuses t get away fast. What's mre, when an ctpus lses an arm, it can grw it back!Studying amazing animals like the ctpus is imprtant because we can learn a lt frm them. But they als shw us hw wnderful nature is and why it is imprtant t prtect it!
Read the text. Chse six amazing things abut ctpuses t cmplete the map.
have eight arms with brains
d nt have any bnes
have three hearts
think abut and d mre than ne thing at nce
fit int small places
change their clur and shape t lk like plants r ther sea animals
prduce ink t get away fast
grw their arms back
-What are they like?They grw hard and heavy shells. The shell is made f calcium carbnate and shaped like a spiral.-What can they d?They can thrive successfully in many habitats with different temperatures and cnditins-What is amazing abut their bdies r abilities?The snail’s bdy is sft and shaped like a tube.Other physical features include a muscular ft, several pairs f tentacles prtruding frm their head, and tw stalks that have eyes n their end.
Think f sme ther amazing animals. Discuss them.
Types f Snails
Breaf intrductin f Snails
Snails are a species f mllusks that belng t the family f gastrpds. They are easily identifiable by their spiral shell, which they retract int when they are in danger r are resting. The nly ther species f gastrpds are called slugs, with the main difference between them and the snail being the lack f a shell in slugs. They are languid creatures, which has als led t the wrd “snail” becming a figure f speech fr being slw. There are ver 4000 species f snails ut there, bradly classified as land snails, freshwater snails, and sea snails.
Physical Descriptin and Appearance
Size:Length: 1.9-27.5 in (4.8 t 70 cm)The smallest species f snail is Angustpila psammin at 4.8 cm, while the largest is the giant whelk at 70 cm.Weight: 0.055-5.51 lb (0.025 t 25 kg)Shell: The shell is a vital part f the snail, hlding mst f its vital rgans. It is made f calcium carbnate and shaped like a spiral.Bdy and Clratin: The snail’s bdy is sft and shaped like a tube. Other physical features include a muscular ft, several pairs f tentacles prtruding frm their head, and tw stalks that have eyes n their end.The primary clratin f snails cnsists f brwn, pink, and yellw. Hwever, striped, red, and white patterns have been bserved n the shell.
Mre Practice
Hw much d yu knw abut snails (蜗牛)? Maybe yu knw that they mve very ___1___, but much f the time snails dn’t mve at all. They are___2___ their shells (壳) sleeping. Nw let’s learn mre abut this ___3___ f amazing animal.When there is ht sun, the snail draws its bdy int its shell and ges t sleep. When it rains, the snail des the ___4___ thing t. The snail can sleep fr as lng as it needs t. It ___5___ all the winter mnths in its shell, asleep.In spring the snail wakes up. ___6___ bdy cmes ut frm the shell. When hungry, the snail lks fr fd. The snail can’t see very well, ___7___ it can smell far away. It helps the snail _____8_____ fd and the new green plants.A snail’s muth is nt big. Yet it has 256,000 teeth! The ___9___ are very small, and yu can’t see them. If yu put a snail in a hard paper bx, it will eat its way ut! If the snail wears ut (磨损) its teeth, it will grw ___10___ nes.
new, spend, in, same, it, tth, but, slwly, find, n, kind, the
t find/find
A baby snail asked his mther, “Why was I brn with a shell that grew s hard and heavy?” His mther said, “Because we dn’t have bnes t hld us up. We can nly mve slwly, s we have a shell t prtect us.” The baby snail asked again, “The caterpillar (毛毛虫) has n bnes, either, and she can’t mve quickly. Why desn’t she have a shell?” The mther snail answered, “That’s because a caterpillar will becme a butterfly. She can fly high int the sky. The sky can prtect her.” The baby snail had anther questin, “But the earthwrm mves like us. He has n bnes and he wn’t turn int a butterfly. Why desn’t he carry a hard and heavy shell?” “Because he can dig a hle and hide under the grund and then the earth can prtect him.”