We’ve talked about snails (蜗牛) and their slow move. But much of the time snails don’t move at all. They are in their shells (壳) —sleeping.

Hot sun will dry out a snail’s body. So at the least sign of hot sun, a snail draws its body into his shell. A snail will die in a heavy rain. So when it rains, a snail does the same thing, too. A snail can sleep for as long as it needs to. It spends all the winter months in its shell, asleep.

In the spring the snail wakes up. Its body, about three inches long, comes out from the shell. When hungry, the snail looks for food. Its eyes, at the end of the top feelers (触角), are very weak. But its sense (感觉) of smell is very strong. It helps the snail to find food and the new greens.

A snail’s mouth is no bigger than the point of a pin (大头针). Yet it has 256,000 teeth! The teeth 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! And if a snail wears out its teeth, it will grow new ones.

1. A snail _________.

　 A. moves more slowly at night　　B. has thousands of feet

C. doesn’t move at all   　　      D. sleeps much of the time

2. In the sentence “A snail draws its body into its shell”, the word “draw” means _____.

　 A. to make with a pencil     B. to push　　C. to pull      D. to move away

3. From the story, we know _________.

　 A. a snail’s shell is very thin     B. a snail can’t see well

　 C. a snail’s nose is quite short    D. a snail’s body changes in different seasons

4. A snail goes to sleep when _____.

　 A. it feels hungry   B. it is put into a paper box  C. spring is coming   D. it rains heavily

5.Which of the following is wrong?

A. In winter the snail doesn’t eat or move.　　B. A snail doesn’t like living under the sun

C. The snail’s teeth can’t be worn out.       D. The snail’s nose helps to find food.

It seems to be strange to you there is a blind spot(点) on the eyes. Here is an interesting experiment that can make something disappear, when one eye is open.

　　Make a card about the size of a postcard and write two English letters L and R on it, L on the left and R on the right. First, hold the card about 80 cm away and you see both the letters. Then close your right eye and look at the letter R only with your left eye. And now, as you move the card slowly towards you, you’ll find the letter L disappearing. But if you move the card nearer to your face, the letter will be seen again. Now do the same experiment with your left eye closed, you’ll find the letter R disappearing.

Why does the letter disappear? It is because there is a blind spot on the eye. When the image of the letter falls on the blind spot, it won’t be seen. That is why either of the letters disappears.

1.The writer of the passage thinks that _____ there is a blind spot on the eye.

A．few people know   B．no one knows      C．most people know   D．all the people know

2.In which order should you do the experiment?

①Hold the card  ②Move the card nearer   ③Close your right eye

④Write two English letters  ⑤Look at the letter R   ⑥Make a card

A．④⑥①②③⑤      B．①③⑥④⑤②      C．⑥①④③②⑤      D．⑥④①③⑤②

3.The passage mainly tells us _______.

A．how to find the blind spot                 B．an interesting experiment

C．where the blind spot is                   D．there is blind spot on the eye