是谁，有两万多颗牙齿？
People almost have seen snails. They sometimes move slowly and sometimes sleep in their shells. The biggest snail’s body is more than ten inches long. The hot sunshine and heavy rain will hurt a snail’s body, so a snail shrinks(缩小） its body into the shell under these circumstances. A snail can sleep for as long as it needs to. It sleeps in its shell for a whole winter.
The snail wakes up in springtime. It comes out from the shell. When they are hungry, they look for food. Their eyes are at the top of feelers（触须）. The snails’ eyes are very weak. But the sense of smell is very strong. It helps snails to find food. The snail’s mouth is smaller than the point of a pin（针）. However, it has 256,000 teeth! The teeth are so small that you can’t see them. If you put a snail in a paper box, it will eat its way out! If a snail wears out its teeth, it will grow new ones.
1.Where do snails sleep?
A During winter.
B Under the sunshine.
C In their shells.
D At the top of feelers.
解析：选C。C 细节理解题。根据第一段第二句可知，蜗牛睡在他们的壳里，故选 C。
2.What does the word “circumstances” probably mean in Chinese?
A 炙热.
B 情形.
C 基础.
D 温度.
解析：选B。B 词义猜测题。根据 The hot sunshine and heavy rain will hurt a snail’s body, so a snail shrinks(缩小) its body into the shell under these circumstances.可知炙热的阳光和暴雨会对蜗牛的身体造成伤害，所以蜗牛在这种 circumstances下会把身体缩进壳里，结合选项，“情形”最符合原文，故选 B。
3.A snail finds food by________.
A touching
B seeing
C smelling
D biting
解析：选C。C 细节理解题。根据第二段第五、六句可知，蜗牛的嗅觉非常灵敏，它帮助蜗牛寻找食物，故选 C。
4.How many teeth does a snail have?
A 256.
B 256 million.
C 256 hundred.
D 256 thousand.
解析：选C。C 细节理解题。根据第二段 However, it has 25,600 teeth!可知一只蜗牛有两万五千六百颗牙齿， 即 256 hundred 颗牙齿，故选 C。
5.What is the passage mainly about?
A The shell of snails.
B Snails’ favorite food.
C The introduction of snails.
D The number of snail’s teeth.
解析：选C。C 主旨大意题。根据全文可知，文章围绕蜗牛展开，介绍了关于蜗牛的各个方面情况，故选 C。