阅读短文，选择正确答案。

      It was Sunday. Mike was at home with his mother. His mother said to him, " I'm going to the park. Are

you going out? " " Yes. I am going to play basketball with Jack." Mike answered. " OK. Lock (锁住) the door

and take care of the key." said his mother. " I will." said Mike. His mother left. Mike finished his homework.

He went to Jack's home. They played computer games together. Then they went to the playground. They

played basketball. They had a lot of fun. It was almost noon. It's time to go home. Mike looked for his key.

He couldn't find it! His mother was back. She was angry, " You forgot (忘记) to lock the door! " 

1. What did Mike do at Jack's home?

A. They watched TV.

B. They played computer games.

C. They did their homework.

2. What did Mike do at the playground?

A. He played basketball.

B. He played football.

C. He played volleyball.

3. Did Mike lock the door?

A. Yes, he did.

B. Yes, he does.

C. No, he didn't.

2010年7月，英国研究小组宣布，蛋壳中的OC-17（一种蛋白质元素）只能在受孕母鸡卵中产生。该研究证实了先有鸡后有蛋，结束了数千年来困扰人类的蛋鸡之争。不过，对于第一只拥有OC-17的母鸡是如何从地球上演变而来的这一问题，目前还没有详细答案。据此获得问题。

先有蛋还是先有鸡之争，历经数年直到今天才得以终结，主要原因是（）

A.蛋和鸡都是不断变化的

B.人们对事物的认识受立场的限制

C.具体的实践水平制约着人们对事物的认识

D.追求真理本身就是反复性和无限性的过程