问题 填空题

如图所示,小明将自制的高度计从教学楼一楼那到五楼,玻璃管中的水柱将______(填“上升、下降或不变”).自制高度计时要注意的问题是______.

答案

只有瓶内气体的压强大于外界大气压时,它才能压着水柱升到瓶口之上;上楼时,高度在升高,大气压会随高度的增加而减小,外界大气压变小,瓶内气压大于外界大气压,会进一步向外压水柱,所以水柱将会升高.自制的气压计或高度计是利用平内外的压强不同导致玻璃管中液柱发生变化,故在制作过程中瓶口必须密封,不能漏气.

故答案为:上升,瓶口必须密封,不能漏气.

完形填空

Barefoot and dirty,the girl just sat and watched the people go by.She never tried to speak.Many people passed,but never did one person stop.

The next day I decided to go back to the park,curious to see if the little girl would still be there.Right in the very spot as she was yesterday,she sat with the saddest look in her eyes.

Today I was to make my own move and walk over to the little girl.As we all know,a park full of strange people is not a place for young children to play alone.

As I began walking towards her,I could see the back of the little girl’s dress indicated a deformity(畸形).I smiled to let her know it was okay,I was there to help,to talk.I sat down beside her and opened with a simple “Hello”.I smiled and she shyly smiled back.We talked until darkness fell and the park was completely empty.I asked the girl why she was so sad.The little girl looked at me and with a sad face said,“Because I’m different.”

I immediately said “That you are!” and smiled.The little girl acted even sadder.She said,“I know.” She looked at me and smiled.Slowly she stood to her feet,and said,“Really?”

“Yes,dear,you’re like a little guardian angel sent to watch over all those people walking by.” She nodded her head “yes” and smiled,and with that she spread her wings and said with a twinkle in her eye,“I am.I’m your guardian angel.”

I was speechless,sure I was seeing things.She said,“For once you thought of someone other than yourself,my job here is done.”

Immediately I stood to my feet and said,“Wait,so why did no one stop to help an angel!?” She looked at me and smiled,“You’re the only one who could see me,and you believe it in your heart.”…and she was gone.

And with that my life changed dramatically.So,when you think you’re all you have,remember,your angel is always watching over you.Mine is!

小题1:People just passed by the girl because _______.

A.they pretended not to see her

B.she pretended to be poor

C.they never thought of helping her

D.they knew the author would help her小题2:Which word can’t be used to describe the author?

A.Considerate.

B.Patient.

C.Helpful.

D.Powerful.小题3:Why was the author speechless?

A.He was shocked.

B.He didn’t manage to help the girl.

C.He thought he was cheated.

D.He was in despair.小题4:Which of the following statements is TRUE?

A.The author smiled because he saw the girl was shy.

B.The author had known that the girl was a real angel.

C.The author believed that an angel was always watching him.

D.The author decided to go back to the park because he was sure that the little girl would be there.小题5:What does “You’re all you have” mean?

A.You are ugly.

B.You are alone.

C.You are strong.

D.You are rich.

选择题