问题 解答题

(1)口袋里有2个红球和4个白球,从中任意摸出2个球,可能的结果有几种?请你列举出来.

(2)上述各种结果发生的可能性一样大吗?如果不一样,哪种结果的可能性更大一些?

答案

(1)可能的结果有3种:

①2个都是白球;

②2个都是红球;

③1个红球和1个白球;

(2)2个都是红球有1种可能;

①2个都是白球:就是从4个白球中选出2个,一共有6种可能;

②1个红球和1个白球:红球是2选1,有2种可能;白球是4选1,有4种可能,一共有:

③2×4=8(种);

8>6>1;

答:它们的可能性不一样大,1个红球和1个白球的可能性最大.

阅读理解

阅读理解。

     We're all connected. You can send an e-mail message to a friend, and your friend can pass it on to

one of his or her friends, and that friend can do the same, continuing the chain. Eventually, your message

could reach just about anyone in the world, and it might take only five to seven e-mails for the message

to get there.

     Scientists recently tested that idea in a study involving 24,000 people. Participants had to try to get

a message forwarded to one of 18 randomly chosen people. Each participant started by sending one

e-mail to someone they knew. Recipients could then forward the e-mail once to someone they knew,

and so on.

     Targets, who were randomly assigned by researchers from Columbia University in New York, lived

in 13 countries. They included an Australian police officer, a Norwegian veterinarian, and a college

professor.

     Out of 24,000 chains, only 384 reached their goal. The rest petered out, usually because one of the

recipients was either too busy to forward the message or thought it was junk mail.

     The links that reached their goal made it in an average of 4.05 e-mails. Based on the lengths of the

failed chains, the researchers estimated that two strangers could generally make contact in five to seven

e-mails.

     The most successful chains relied on casual acquaintances rather than close friends. That's because

your close friends know each other whereas your acquaintances tend to know people you don't know.

The phenomenon, known as the strength of weak ties, explains why people tend to get jobs through

people they know casually but aren't that close to.

     So, start networking and instant messaging now. As they say in show business: It's all about who

you know.

1. If you want to get into touch with a stranger in the world, how many e-mails might it take for the

message to reach him/her?

A. 5 to 7

B. 18

C. 13

D. 384

2. Which of the following is Not true about the test?

A. 24,000 people took part in the study and sent e-mails to people they knew.

B. The 18 targets were chosen by chance.

C. About 98.4% of the mails didn't reach their goal because some people were too busy or they mistook

the message for junk mail.

D. The targets come from 13 countries, such as Australia, Norway and New York.

3. What does the word "estimate" mean in the passage?

A. make sure

B. suppose

C. think over

D. imagine

4. Why do people tend to get jobs more easily through casual acquaintances than close friends?

A. Because close friends don't talk with each other so much.

B. Because casual acquaintances can help you know more people and make more friends.

C. Because close friends don't spend so much time gathering together.

D. Because casual acquaintances are kinder and more willing to help others.

5. In which part of a newspaper will readers read this passage?

A. Culture

B. Entertainment

C. Information and Technology

D. Health

问答题 简答题