仔细阅读下列短文, 根据题目, 选出最佳选项. We've talked about snails(蜗牛)and their slow move. But much of the time snails don't move at all. They're 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 its shell and closes the opening with a thin cover. Then it goes to sleep. A snail will die in a heavy rain. So whenever it rains, it goes inside its shell house and goes to sleep. A snail can sleep for as long as it needs to. It can take a short sleep. Or it can sleep for days at a time. And it spends all the winter months in its shell, asleep. In spring the snail wakes up. Its body, about three inches long, comes out from the shell. When hungry, the snail looks for food. It can't see very well. Its eyes, at the ends of the top feelers(触角)are very weak. But its sense of smell(味觉)is very strong. It helps the snail to the new greens. Then the snail's little mouth goes to work. A snail's mouth is no bigger than the point of a pin(针). Yet it has 256,000 teeth! The teeth are so small that you can't see them. But they do their work. 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. Mostly, a snail looks for food at night. But on cloudy days it eats in the daytime. It eats all day long. A snail can go on eating for hours and never feel full.

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(阅读理解)

Skin-diving (潜水)is a new sport today. This sport takes you into a wonderful new world. It is like a visit to the moon. When you are under water, it is easy for you to climb big rocks, because you are no longer heavy.

Here, under water, everything is blue and green. During the day, there is plenty of light. When fishes swim near, you can catch them with your hands.

Because you have tanks (罐)of fresh air on your back, you can stay in deep water for a long time.

To catch fish is one of the most interesting parts of this sport. Besides it has many uses. For example, you can clean ships without taking them out of water. You can get many things from the deep sea.

Now you see that skin-diving is both useful and interesting.

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阅读理解: 阅读下面短文, 根据短文内容, 选择最佳选项. "Cool" is a word with many meanings, It can be used to express feelings of interest in almost everything. When we see a famous car in the street, maybe we will say, "It's cool. " When we see a famous singer, we may say, "She's cool. " Today, we use the word "cool" to replace(替代)many words, such as "great"or "nice". Here's an interesting story about the word "cool". A teacher asked his students to write about a large hall. One of his students wrote just one sentence, "It's so cool. "Maybe he thought it was the best way to show what he saw and felt. But it also tells us that we should think of many other words to describe things we see and feel.

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