问题 选择题

小球沿固定光滑斜面下滑的过程中受到的作用力共有(  )

A.一个

B.两个

C.三个

D.四个

答案

地球表面的一切物体都受到重力;

物体与斜面之间相互挤压,故一定受到支持力;

光滑表示没有摩擦力;

故物体只受重力和支持力,两个力;

故选B.

完形填空

An eight-year-old child heard her parents talking about her little brother. All she knew was that he was very sick and they had no money left. When she heard her daddy say to her  1 mother with whispered desperation(绝望), “  2 a miracle(奇迹) can save him now”, the little girl went to her bedroom and took out her piggy bank. She   3 all the change out on the floor and counted it carefully. Then she   4 her way six blocks to the local drugstore(药店).

“And what do you want?” asked the chemist.

“It’s   5 my little brother,”  the girl answered back. “He’s really, really sick and I want to buy a   6  . His name is Andrew and he has something  7 growing inside his head and my daddy says only a miracle can save him.”

“We don’t   8  miracles here, chilD.I’m sorry,” the chemist said, smiling   9 at the little girl.

In the shop was a   10 customer. He stooped (弯腰) down and asked the little girl, “What kind of miracle does your brother   11  ?”

“I don’t know,” she replieD.“He’s really sick and mommy says he needs   12  . But my daddy can’t pay for it, so I have brought my  13  .”

“How much do you have?” asked the man.

“One dollar and eleven cents,   14 I can try and get some more,”  she answered quietly.

“Well, what a coincidence(巧合),”  smiled the man.  “A dollar and eleven cents — the   15 price of a miracle for little brothers.  16 me to where you live. I want to see your brother and   17 your parents.”

That well dressed man was Dr Carlton Armstrong, a surgeon(外科医生). The operation was completed without   18 and it wasn’t long before Andrew was   19 again and doing well.

The little girl was happy. She knew exactly how much the miracle cost ... one dollar and eleven cents ... plus the  20 of a little child.

1. A.tearful                  B.hopeful              C.helpless                D.kind

2. A.Simply                 B.Just                   C.Only                    D.More than

3. A.drew                    B.pulled                C.put                       D.poured

4. A.followed               B.made                 C.took                     D.found

5. A.to                        B.as                      C.for                       D.on

6. A.hope                    B.doctor               C.favor                    D.miracle

7. A.bad                      B.small                 C.extra                    D.impossible

8. A.have                     B.offer                 C.sell                       D.store

9. A.gently                 B.sadly                 C.strangely               D.coldly

10.A.well dressed         B.kind hearted       C.well behaved         D.good looking

11.A.have                    B.need                  C.care                      D.like

12.A.a doctor               B.a surgeon           C.an operation          D.a kindness

13.A.savings                B.wishes               C.ideas                    D.suggestions

14.A.since                   B.as                      C.after                     D.but

15.A.same                   B.exact                 C.proper                  D.necessary

16.A.Show                  B.Help                  C.Take                     D.Follow

17.A.help                    B.encourage          C.persuade               D.meet

18.A.difficulty             B.delay                 C.charge                  D.result

19.A.happy                  B.well                  C.strong                   D.home

20. A.cleverness          B.faith                  C.courage                D.devotion

单项选择题