Question

Rats usually live in holes.They run from these holes to the places where they eat and drink.They have special paths on which they travel each time.So they know their paths quite well.

If anything new，such as stone or wood，is put in the path，the rats won’t go near it at first as they are too frightened.It will take them many days to get over the fear.They are also frightened to go near a place that they know，where something has been taken away.If a path goes around a rock，the rats follow the same path around the rock each time.If the rock is taken away，they will still run round the place where the rock was！They won’t cross the empty place which is now open to them，even though it would be quicker.

Rats will always keep away from anything unusual to them.That’s why they won’t eat poison on the first or second night.They usually won’t go anywhere near it for about four days until they get used to being there.Even then they only eat a little at a time.

If people want to kill rats with poison，all they have to do is to leave it out for a few days.Once the rats have got used to it，they will eat it，and die.

56．This passage mainly tells us________.

A．how a rat destroys our food                   B．how to poison a rat

C．what a rat’s habit is                               D．poisoning a rat is not easy

57．How does the writer feel about rats?

A．They are clever and cunning.

B．They are the most dangerous enemy.

C．They are not smart but shy.

D．It’s easy for them to get close to an unknown object.

58．________，rats have special paths to travel each time.

A．Because they live in holes most of the time

B．To find more food to eat and enough water to drink

C．In order not to eat anything poisonous

D．To protect themselves

59．If you want to kill a rat，________.

A．you should make it get used to the poison

B．you should drive it out of the hole

C．you should place a rock on the path along which it runs

D．you should make it get over the fear to cross

Answer 1

56．B　文章开头提出人们药老鼠时发现的问题(它们不吃有毒的食品)，结尾指出药老鼠应该怎么做，这就说出了中心思想：怎样药老鼠。中间段落描述老鼠的习性只是为了说明老鼠为什么在一两天内不碰毒药，不是中心内容，故不选C项。

57．C　人们通常认为老鼠狡猾又聪明，但实际观察表明，它只是胆怯，故选择C项。D项与原文相反。

58．D　文中提到老鼠只走他们熟悉的路线。如果出现新的情况，老鼠会感到frightened，所以选择“为了保护自己”。

59．A　从文中论述老鼠的习性及最后一段的总结，可知只要老鼠习惯了毒药的存在，它就会吃。