污水处理的主要方法有：①中和法；②化学沉淀法；③氧化还原法；④过滤法。其中属于化

     On Sunday morning, a strong earthquake hit Indonesia and then big tsunamis(海啸)followed.

They soon went on to other countries in the South and Southeast Asia as well as East Africa.

     Tsunamis are especially dangerous for children. By Wednesday, nearly 60, 000 people died

because of the tsunamis. One third of them were children, and most of them were 5 to 12 years old.

In may Asian countries near the sea, poor kids helped their parents fish. So they were in harm's way

when the tsunamis came. In Sri Lanka, when the first waves hit, thousands of children came to the

seaside. The waves brought in fish. The old and the young collected them. Many waited for more.

Then tsunamis six metres high hit the island of 19 million people.      

     ''They got caught and could not run to safety. This is the reason why so many children have died,"

said a police spokesman in Sri Lanka.

     In open seas tsunamis are only one or two metres high. When they are near land, they are as high

as 10 metres. Houses and cars near the sea can be taken away by these big waves. Because tsunamis

move fast and can travel to another side of the sea within on day, they may affect a lot of places.

     The Pacific Ocean(太平洋)has a lot of strong tsunamis because of the size of the ocean and large

earthquakes there. China doesn't see tsunamis often because its sea floor is quite flat. Islands around

China also help the country avoid them.

     What should you do when there's a tsunami? Move to a safe place. If you are near the sea and you

feel the earthquake, move to higher ground. Stay away from rivers and streams.

根据短文内容，选择最佳答案。

1. Which places did the big tsunamis hit?      

A. All the seaside countries.

B. South and Southeast Asia as well as East Africa.

C. Only Indonesia and Sri Lanka.    

2. Which of the following is WRONG?    

A. In open seas tsunamis are one or two metres high.

B. Sri Lanka has a population of 19, 000, 000 children.

C. Most of the children who died in tsunamis were 5 to 12 years old.   

3. Many children died in tsunamis because _________.    

A. they played happily near the sea and fell into it carelessly

B. sharks appeared and ate the children

C. they helped their parents fish near the sea and could not run to safety      

4. Why doesn't China see a tsunamis often? 

A. Because of the size of the ocean.

B. Because of large earthquakes.

C. Because its sea floor is quiet flat.  

5. What should you do when there's a tsunami according to the passage?    

A. Listen to a weather report.

B. Run to your parents for help.

C. Get to a safe place as soon as possible.

— Is that ____________ mother?

— No, she is ____________ mother.[ ]

A. my, your

B. your, my

C. your, his

D. you, you

成人骨软骨病是指（）。

A.是指骨矿丢失大于骨有机质

B.是指骨矿和骨有机质呈现平行减少

C.是指骨矿丢失小于骨有机质

D.成人期骨代谢过程中新形成的类骨质的界面上骨基质的矿化障碍，可引起骨折和畸形

E.以上都不对

She started to work                 a teacher in India     in 1929.      [ ]

A. for      

B. as        

C. on        

D. out

聚酰胺色谱柱对下列中哪类成分的吸附性强， * * 不可逆

A．黄酮类
B．酚类
C．醌类
D．鞣质
E．糖类