Big rats like sheep could be real in the future. Big rats could be 80kg. Rats are now all over the Earth. They are in places that never had rats before. They are the strongest animals in many places. Maybe no other animals can kill rats in the future . 

People take rats around the world. They can live almost anywhere. The future might have many kinds of different rats. After the dinosaurs（恐龙）, many small animals grew big. The same thing could happen with rats. They might make other animals die. A question is what we would do about big rats.

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1.What will be big like a sheep in the future?

A Ducks.

B Frogs.

C Cats.

D Rats.

解析：选D。D 细节理解题。根据第1段第1句Big rats like sheep could be real in the future.可知，故选D。

2.How heavy could the rats be in the future?

A 8kg.

B 80kg.

C 8kg.

D 800kg.

解析：选B。B 细节理解题。根据第1段第2句Big rats could be 80kg.可知，故选B。

3.Rats go around the world with______.

A pandas

B people

C cats

D cats

解析：选B。B 细节理解题。根据第2段第1句People take rats around the world.可知，故选B。

4.The underlined word“They” refers to（指)______.

A people

B dinosaurs

C rats

D other animals

解析：选C。C 综合理解题。根据第2段倒数第5、6句The same thing could happen with rats. They might make other animals die.可知，故选C。

5.How did dinosaurs die?

A Rats killed them.

B People killed them.

C They killed themselves.

D We are not sure how they died.

解析：选D。D 内容理解题。文中未提到恐龙如何死的，故选D。