在“文字昭晰，义理环周”中，“环周”之义为（） A.绕行一周 B.四周相连 C.完备

阅读理解。

    1970 was World Conservation (保护) Year. The United Nations wanted everyone to know that the

world was in danger. They hoped something could be done.

     Here is one example of the problem. At one time there were 1,300 kinds of plants, trees and flowers

in Holland (荷兰), but now only 866 are left. The others have been destroyed (毁灭) by modern people

and their science. We are polluting earth, air, water and everything around us. We can't live without

these things. If things go on like this, we shall destroy ourselves.

     What will happen in the future? Perhaps it's more important to ask "What must we do?" More and

more young people have known this. Many of them are helping to save our earth. For example, they plant

trees. In a small town in the United States a large group of girls cleaned the banks of 11 kilometres of their

river. Young people may hear about conversation through a song called "No one's going to change our

world". It was made by Cliff Richard and other singers. The money from it will help to conserve tigers,

elephants and pandas on the earth.

1. The United Nations hoped something could be done            . [ ]

A. to conserve the world

B. to change the world

C. to develop the world

D. to destroy the world

2. Why aren't there so many plants, trees and flowers in Holland now? Because            . [ ]

A. people there didn't need so many plants, trees and flowers

B. people there want to destroy themselves

C. little conservation has been done there

D. people need more land to live on

3. How many kinds of plants, trees and flowers have been destroyed in Holland? [ ]

A. 1300

B. 988

C. 3166

D. 434

4. We shall destroy ourselves if we go on           . [ ]

A. Planting trees and flowers

B. polluting earth, air and water around us

C. saving the world

D. helping to conserve tigers, elephants and pandas

5. What must we do now according to the passage? [ ]

A. Save the world

B. Clean the banks of river

C. Sing songs

D. Get money

读某海域2月表层海水等温线图，完成（1）——（3）题。

（1）图中M与N的温差为[ ]

    A、4°C

    B、6°C

    C、8°C

    D、10°C

（2）图中4条海流（洋流）中，其性质基本一致的是 [ ]

    A、Ll和L3

    B、L2和L4

    C、L3和L4

    D、L4和Ll

（3）此时期，该海域[ ]

    A、多盛行东南风

    B、飓风时有发生

    C、黑夜长于白昼

    D、与陆地温差小

The weather in Beijing is colder than ________ in Guangdong.[ ]

A. it

B. the one

C. that

D. this

石决明的药用部位是 （）

A.卵鞘

B.贝壳

C.雌虫干燥体

D.干燥内壳

E.背甲

开机过程中疏水如何倒换？