资源简介

(共14张PPT)
Unit 1 R·七年级下册
别让人类成为最孤单的生命！
Reading Plus
Objectives
know some amazing things about octopuses
draw a mind map of amazing things about octopuses
know some amazing things about other animals
know some amazing things about snails
do some exercise about snails
Among the many amazing animals in the world, few are as strange and unusual as the octopus. There are around 300 different kinds of octopuses, and they come in all sizes! The smallest is only around 2.5 centimetres long, but some octopuses can grow up to more than five metres long. There was even an octopus over nine metres long!
The Amazing Octopus
The octopus's body is very interesting. All octopuses have eight arms. Their brain is not just in their head, but also in their arms! This helps them to think about and do more than one thing at once. Octopuses can also fit into small places because they do not have any bones! And did you know that octopuses have three hearts These hearts work with different parts of the body.
Octopuses can also do many amazing things. They can change how they look. They can change their colour and shape to look like plants or other sea animals. Octopuses can also make ink.
They keep it inside very small bags in their body. When they produce ink, the ink makes it hard for other animals to see them. This helps octopuses to get away fast. What's more, when an octopus loses an arm, it can grow it back!
Studying amazing animals like the octopus is important because we can learn a lot from them. But they also show us how wonderful nature is and why it is important to protect it!
1
Body
Read the text. Choose six amazing things about octopuses to complete the map.
The octopus
Ability
have eight arms with brains
do not have any bones
have three hearts
think about and do more than one thing at once
fit into small places
change their colour and shape to look like plants or other sea animals
produce ink to get away fast
grow their arms back
-What are they like
They grow hard and heavy shells.
The shell is made of calcium carbonate and shaped like a spiral.
-What can they do
They can thrive successfully in many habitats with different temperatures and conditions
-What is amazing about their bodies or abilities
The snail’s body is soft and shaped like a tube.
Other physical features include a muscular foot, several pairs of tentacles protruding from their head, and two stalks that have eyes on their end.
2
Think of some other amazing animals. Discuss them.
Types of Snails
Breaf introduction of Snails
Snails are a species of mollusks that belong to the family of gastropods. They are easily identifiable by their spiral shell, which they retract into when they are in danger or are resting. The only other species of gastropods are called slugs, with the main difference between them and the snail being the lack of a shell in slugs.
They are languid creatures, which has also led to the word “snail” becoming a figure of speech for being slow.
There are over 4000 species of snails out there, broadly classified as land snails, freshwater snails, and sea snails.
Physical Description and Appearance
Size:
Length: 1.9-27.5 in (4.8 to 70 cm)
The smallest species of snail is Angustopila psammion at 4.8 cm, while the largest is the giant whelk at 70 cm.
Weight: 0.055-5.51 lb (0.025 to 25 kg)
Shell: The shell is a vital part of the snail, holding most of its vital organs. It is made of calcium carbonate and shaped like a spiral.
Body and Coloration:
The snail’s body is soft and shaped like a tube. Other physical features include a muscular foot, several pairs of tentacles protruding from their head, and two stalks that have eyes on their end.
The primary coloration of snails consists of brown, pink, and yellow. However, striped, red, and white patterns have been observed on the shell.
More Practice
How much do you know about snails (蜗牛) Maybe you know that they move very ___1___, but much of the time snails don’t move at all. They are___2___ their shells (壳) sleeping. Now let’s learn more about this ___3___ of amazing animal.
When there is hot sun, the snail draws its body into its shell and goes to sleep. When it rains, the snail does the ___4___ thing too. The snail can sleep for as long as it needs to. It ___5___ all the winter months in its shell, asleep.
In spring the snail wakes up. ___6___ body comes out from the shell. When hungry, the snail looks for food. The snail can’t see very well, ___7___ it can smell far away. It helps the snail _____8_____ food and the new green plants.
A snail’s mouth is not big. Yet it has 256,000 teeth! The ___9___ are very small, and you can’t see them. If you put a snail in a hard paper box, it will eat its way out! If the snail wears out (磨损) its teeth, it will grow ___10___ ones.
new, spend, in, same, it, tooth, but, slowly, find, on, kind, the
slowly
in
kind
same
spends
Its
but
to find/find
teeth
new
A baby snail asked his mother, “Why was I born with a shell that grew so hard and heavy ”
His mother said, “Because we don’t have bones to hold us up. We can only move slowly, so we have a shell to protect us.”
The baby snail asked again, “The caterpillar (毛毛虫) has no bones, either, and she can’t move quickly. Why doesn’t she have a shell ”
The mother snail answered, “That’s because a caterpillar will become a butterfly. She can fly high into the sky. The sky can protect her.”
The baby snail had another question, “But the earthworm moves like us. He has no bones and he won’t turn into a butterfly. Why doesn’t he carry a hard and heavy shell ”
“Because he can dig a hole and hide under the ground and then the earth can protect him.”
More Practice
The baby snail cried, “We’re so poor! We have no protection from the sky or the earth!”
The mother snail smiled at him, “That’s why we have a shell. We don’t depend on (依靠) the sky or the earth for protection. We depend on ourselves.”
More Practice
1. What are the common things between the snail and the caterpillar
a. They don’t have bones. b. They don’t move quickly.
c. They live under the ground.
A. ab B. bc C. ac D. abc
√
2. What is the underlined word “earthworm”
A.
B.
C.
D.
√
Homework
1. Find more information about interesting and amazing animals.
2. Write a short passage about the amazing animal you find and share it with your friends.

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