题目内容：

    Ready or not, here they come: Scientists who played hide-and-seek with rats found that their furry subjects seemed to love the game- and they were remarkably good at it.

The researchers taught six adolescent male rats how to play a one-on-one version of hide-and-seek. They equipped a large room with cardboard barriers and small containers to serve as hiding places for humans and rats, respectively. The game started when the rat was placed in a small box in the middle of the room. If the rat was the “seeker,” the scientist would hide and then remotely open the box. If the rat was the “hider the scientist would crouch (蹲伏) by the box when the rat came out. This prompted the little rodent to running quickly for cover. All six rats learned how to be the seeker. Five of them were able to handle hiding as well.

Compared with something like playful wrestling, hide-and-seek is more complex for several reasons. It requires an understanding of the rules, a clear grasp of players’ distinct roles and the ability to assume different roles on different rounds. This unconventional experiment sheds light on the sophisticated sense of play in these tiny rodents, and also hints at the evolutionary usefulness of this type of play.

Peggy Mason, a neurobiologist (神经生物学家) at the University of Chicago, said that she was most impressed by the discovery that the rats didn’t just learn hide and seek—they wanted to play it. Play probably helps young animals learn how to socially interact, Mason said. She pointed to evidence that when rodents are prevented from playing during early development, they don’t grow into normal adults. Instead, they become anxious, they don’t play well with others and they aren’t great parents.

1.What can we know about the experiment?

A.Rats do better than other creatures in hide-and-seek.

B.Rats may enjoy themselves in hide-and-seek.

C.Rats prefer hide-and-seek to other games.

D.Rats may be subject to humans in hide-and-seek.

2.What may drive the rat to hurriedly hide in the experiment?

A.The scientist’s getting close.

B.Potential danger out of the box.

C.Its sense of safety under the cover.

D.Other rats’ call for help.

3.Which of the following best describes hide-and-seek?

A.Unique B.Outdated

C.Easy D.Demanding

4.What may be a possible cause of a poor rat parent?

A.Deep anxiety over their kids’ growth.

B.Unwillingness to get on well with their kids.

C.A lack of confidence in their kids.

D.Absence of play in their early life.