5.C。根据短文最后一句话“And if a snail wears out its teeth, it will grow new ones.”，可以判断C项是明显的错误。

Passage2

　This dictionary tells you about English words and how to use them in reading, writing and speaking English. It not only gives the meaning of words, it can also help you with spelling, word building, grammar and pronunciation.

　To use your dictionary correctly, you need to understand how the dictionary works. At the front of the book, you will find some exercises to help you make the most use of your dictionary.

　If you look up the word “colour”, you will find two spellings for this word. “Colour” is used in British English, while “color” is used in American English. When such a thing happens, the dictionary shows it with the word “BrE” for British English and “AmE” for American English.

The dictionary also helps you pronounce words correctly. It uses a special alphabet (特殊字母表) to show pronunciation. If you turn to the inside back face, you will see all the phonetic letters (音标) with some words to show you how they are pronounced. Just have a look this page when you’re not sure how to say a word.

　The most important reason for using a dictionary is to find out the meaning of a word-its definition.

　In this dictionary, the definitions have been written using only 2000 words. This means that the definitions of even the most difficult words are simply explained (简单解释) and easy to understand.

　When a word has more than one meaning, read all the meanings until you find the one that correctly tells the use of the word you are looking for.

　Most of the words in this dictionary can be used by people in all parts of the world.

4.D。关键要理解好“So when it rains, a snail does the same thing, too.”这句话中的“the same thing”的意思。事实上，由“In the spring the snail wakes up. … comes out from the shell.”和“…in a hard paper box, it will eat its way out!”是很容易排除B、C和A的。

3.B。答案即是“Its eyes, at the end of the top feelers are very weak.”这句话。

2.C。本题属熟词新义。由“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.”一句的意思，尤其是要仔细考虑关键词“into”对猜测词义的辅助作用，可知蜗牛一旦碰到炙热的太阳，就会把身体蜷缩进壳里。

1.D。根据开头的“But much of the time snails don’t move at all. They are in their shells ----sleeping.”这句话，显然只有D是正确答案。

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.

[答案与解析]这篇短文向我们介绍了蜗牛的生活习性。无论是烈日当空，还是大雨滂沱，蜗牛都会像整个冬季一样，呆在壳里睡觉。春天来临的时候，蜗牛就拖着三英寸长的身体从壳里钻出来，靠它那灵敏的触角觅食。别看它的嘴比大头针尖大不了多少，却长着25万多颗牙齿呢！

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

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

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

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