问题 多选题

如图所示,将甲、乙两个完全相同的圆台状容器里装满水,水对容器底的压强分别为P和P,水对容器底的压力分别为F和F.则以下判断正确的是(  )

A.P<P

B.P=P

C.F=F

D.F>F

答案

由题可知,甲、乙两个完全相同的圆台状容器里装满水,

∴将容器倒置后,液面深度不变,

由公式p=ρgh可知,

∴水对容器底的压强不变,即P=P

∵F=ps,

而倒置后底面积减小,

∴水对容器底部的压力变小,即F>F

故选B和D.

阅读理解

阅读理解。

Dear Editor,

     I'm a Senior 1 student in a middle school. This term, my favourite teacher, Miss Mao, no longer teaches

us. I want to see her, but I'm afraid that she no longer likes me and I don't want to trouble her. I really miss

her. What should I do? 

                                                                                                                                             Tian Yan

Dear Tian Yan,

     It's bad luck that you have lost your favourite teacher. But, if she is still in your school, nothing can stop

you going to see her. When she isn't busy, ask her if she minds having a quick chat. You can then tell her

she was your favourite teacher. Everyone is happy to know they are liked!

     If she has left the school, it will be more difficult to meet her. It will be hard, but remember people always

come and go in our lives. We can't rely on (依靠) them being with us all the time.

     You may be sad to say goodbye to her, but we can remember and learn from her. Think of her best

qualities. 

     You could also try looking for similar qualities in your other teachers. Study hard and give your new

teacher a chance. In time, you might start to see that he or she has different qualities to learn from.

      Finally, you can not completely rely on other people getting you through your studies, or even your life. 

                                                                                                                                                Editor

1. Tian Yan ______.

A. is a troublemaker

B. likes Miss Mao very much

C. is happy these days

D. doesn't like to tell her secret to anyone

2. Which of the following does the editor advise Tian Yan NOT to do?

A. Find a time to see Miss Mao.

B. Have a short chat with Miss Mao.

C. Tell Miss Mao she likes her.

D. Keep quiet about the thing.

3. The expression"in time" in this passage means "______".

A. over a period of time

B. on time

C. at the right time

D. a long time ago

4. According to the passage, students can make progress in their studies ______.

A. completely by their favourite teachers

B. completely by their favourite classmates

C. mainly by their parents

D. mainly by themselves

多项选择题