问题 填空题

为了估计湖里有多少条鱼,有如下方案:从湖里捕上100条鱼做上标记,然后放回湖里,经过一段时间,待带标记的鱼完全混合于鱼群后,第二次再捕上200条,若其中带有标记的鱼有10条,那么估计湖里大约有______条鱼.

答案

设湖里大约有x条鱼.

根据公式得:

10
200
=
100
x

解得:x=2000.

经检验x=200是方程的解.

答:湖里大约有2000条鱼.

故答案为2000.

阅读理解

请阅读以下相关的职业或兴趣爱好:

A.The person works in a hospital emergency room. His/her job is to assist doctors to rescue patients who are seriously ill.

B.The person likes sports activities the most. For him/her, having sports activities is very interesting.

C.The person works for himself/herself at home. He/She writes for others.

D.The person doesn’t like other things such as gardening. But he/she really likes music, especially classical music.E.     The person likes collecting all kinds of things, such as baseball cards and stamps.

F.     Many people may like collecting things, such as collecting cards or stamps. But he/she likes reading very much.

请阅读以下个人信息,然后匹配与他们相关的职业或兴趣爱好:

1. Mary: I never used to like stamp collecting. I read almost everything I can: books, magazines, newspapers. I go to the public library about twice a week. If you’d like to send me something, maybe books are my favorite.

2. Tom: My wife says I should take up gardening. We have a big garden and she loves working in it. But the truth is, it bores me. My friends and my wife think I’m really boring, because I’m always listening to music. I go to concerts all the time. I love Mozart and all that classical staff.

3. Mike: I don’t really like video games and that sort of things. I prefer being outdoors, hiking or playing sports. I always go out with my family playing baseball and stuff all the time. I think most sports are pretty interesting.

4. Lisa: I’m a free writer, and a lot of people think my job is easier because I don’t have to go to the office every day. And I don’t have to deal with office politics. But, you know, my job is very hard. I have to be very organized and much disciplined. And pretty self-motivated. And when I have a problem, there is no one around to help me.

5. Victor: My life is very stressful. In my working place, everyone is in a hurry and under tremendous pressure. The doctors are demanding, and there is always too much to do to save a dying patient.

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