问题 选择题
下列说法正确的是(  )
A.一个游戏的中奖概率是
1
5
,则做5次这样的游戏一定会中奖
B.一组数据6,8,6,8,8,9,10的众数和中位数都是8
C.为了了解一批电视机的使用寿命,应该采取普查的方式
D.若甲组数据的方差S2=0.02,乙组数据的方差差S2=0.2.则乙组数据比甲组数据稳定
答案

A、一个游戏的中奖概率是

1
5
,则做5次这样的游戏不一定会中奖,故本选项错误;

B、一组数据6,8,6,8,8,9,10的众数和中位数都是8,正确;

C、为了了解一批电视机的使用寿命,应该采取抽样调查的方式,故本选项错误;

D、若甲组数据的方差S2=0.02,乙组数据的方差差S2=0.2.则甲组数据比甲组数据稳定,故本选项错误.

故选B.

阅读理解

阅读理解。

     Noise pollution is doing much harm to our health now. Noise is a kind of invisible (无形的) killer. More

and more students enjoy listening to music very much. When they listen to MP3 players, they like to turn up

the volume (音量). While watching TV, they keep the volume up. But they haven't realized that the noise is

weakening (减弱) their hearing. In fact, the noise not only influences each member in the family, but also

influences the neighbor.

     Noise pollution is a source of misery to people in our society. If people are often disturbed by it, they may

feel uncomfortable or sad. What's worse,the noise can make people mad sometimes. If a worker works in a

printing factory for too long, his hearing loss is much faster than a common person working in a quieter

environment. So everybody must pay attention to noise pollution.

     The following simple ways can be used to avoid (避免) noise:

     ★Try to use less noisy equipment (设备) (e.g. washing machines).

     ★Keep the volume of TV, radio and music as low as possible, especially late at night.

     ★If your dog barks when left alone,make sure to leave it with a friend.

     ★If you have a party,tell your neighbors in advance (提前) and keep the noise a little lower.

     I think the local environment protecting department (部门) will take measures to control the noise levels.

But it's everybody's duty to keep a quiet environment.

1. Why do people call noise a kind of invisible killer?

A. Because we can't see it with our own eyes.

B. Because it's harmful to our health, but people don't realize it.

C. Because it often causes people to die.

D. Because it has no direct effect on humans.

2. The underlined word "misery" means "_________" in English.

A. enjoyment

B. worry

C. pleasure

D. suffering

3. Which of the following is NOT true according to the passage?

A. Listening to MP3 players too loud may do harm to your hearing.

B. Everybody has a duty to keep a quiet environment.

C. We should never use noisy equipment.

D. Noise is a kind of unwanted sound.

4. We can see this passage in a magazine about _________.

A. science

B. geography

C. environment

D. fashion

5. What's the best title for this passage?

A. Kinds of Pollution

B. Noise Pollution

C. Hearing Loss

D. Our Health

多项选择题