好发于40岁以上的“恶性骨肿瘤”是（） A.骨脂肪肉瘤 B.扁骨的纤维肉瘤 C.原发

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

安装在室内墙内的分线盒，可安装在踢脚线的上方，盒底距踢脚线（）毫米。

A、35

B、40

C、50

D、55

已知点P的坐标为(m，n)，O为坐标原点．连接OP，将线段OP绕O点顺时针旋转90°得OP₁，则点P₁的坐标为（）．

使左旋多巴疗效下降的是

A．高蛋白饮食
B．低蛋白饮食
C．高糖饮食
D．低糖饮食
E．低盐白饮食

甲、乙、丙、丁设立了一个普通合伙企业，各持有25%的份额。在经营期间，甲分别与乙及合伙人以外的戊达成协议，将所持有的合伙企业份额的一半转让给乙，另一半转让给戊。对此，下列判断正确的是( )

A．甲向乙转让份额，须经其他合伙人半数以上同意

B．甲向乙转让份额，其他合伙人有优先购买权

C．甲向戊转让份额，仅需通知其他合伙人即可

D．甲向戊转让份额，须经其他合伙人一致同意