人类最危险的敌人——老鼠
Who are human being's most dangerous enemy? The lions? The tigers? Or the aliens? The answer is the rats. Rats carry many diseases which has killed hundreds of millions of people.
They not only carry diseases into people's homes,but also take people's food. They eat 33 million tons of grain every year. That is enough to feed 200 million people—so people die of hunger because rats eat their food.
Rats are clever too. They have good leaders. Men try to poison them, but if their leaders tell them that food is dangerous they will not eat it. So our cities and villages are full of rats. This dangerous enemy is too clever and grows too fast, so we cannot wipe out them.
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1.Who are human being's most dangerous enemy?
A The lions.
B The tigers.
C The aliens.
D The rats.
解析：选D。细节理解题。根据第一段中的Who are human being's most dangerous enemy?和The answer is the rats.可知人类最危险的敌人是老鼠，故选D。
2.What do rats carry?
A Diseases.
B Money.
C Corn.
D Salt.
解析：选A。细节理解题。根据第一段最后一句Rats carry many diseases which has killed hundreds of millions of people.可知老鼠传播许多疾病，故选A。
3.How much grain do rats eat every year?
A 3 million tons of grain.
B 33 million tons of grain.
C 33 billion tons of grain.
D 333 billion tons of grain.
解析：选B。细节理解题。根据第二段第二句They eat 33 million tons of grain every year.可知它们每年吃掉三千三百万吨粮食，故选B。
4.Will the rats eat something that their leaders tell them it is dangerous?
A Yes, they will.
B Yes, they are.
C No, they aren’t.
D No, they won’t.
解析：选D。细节理解题。根据第三段第三句Men try to poison them, but if their leaders tell them that food is dangerous they will not eat it.可知人们试图毒死它们，但如果它们的领导人告诉它们食物是危险的，它们就不会吃，故选D。
5.What’s the meaning of “wipe out”?
A 饲养
B 放生
C 消灭
D 研究
解析：选C。词义猜测题。根据第三段最后一句 This dangerous enemy is too clever and grows too fast, so we cannot wipe out them. 并结合前文可知，wipe out意为“消灭”，故选C。