问题 选择题

下列说法正确的是

A.温度越高布朗运动就越激烈,所以布朗运动也叫做热运动

B.由水的摩尔体积和每个水分子的体积可估算出阿伏伽德罗常数

C.在压缩气体时需对气体做功,这是因为气体分子间的斥力大于引力

D.水和酒精混合后的体积小于原来体积之和,说明分子间存在的引力

答案

答案:B

布朗运动越激烈反映了液体分子运动越激烈,液体温度越高,叫分子热运动,A错误;对液体和固体可以由摩尔体积和每个分子的体积估算出阿伏伽德罗常数,B正确;在压缩气体时需对气体做功是因为需要克服气体压强才能压缩,C错误;水和酒精混合后的体积小于原来体积之和说明分子间存在间隙,D错误。答案B。

阅读理解

A friend of mine named Paul received an expensive car from his brother as a Christmas present.On Christmas Eve when Paul came out of his office,a street urchin(顽童)was walking around the shining car.“Is this your car,sir?”he asked.

Paul answered,“Yes,my brother gave it to me for Christmas.”The boy was surprised. “You mean your brother gave it to you and it did cost you nothing?Sir,I wish…”He hesitated(犹豫),Paul thought of course he knew what the boy wanted,but what the boy said surprised him greatly.“I wish,”the boy went on,“that I could be a brother like that.”Paul looked at the boy in surprise,and then he said again,“Would you like to take a ride in my car?”“Oh yes,I’d   love to ,”the boy answered.

After a short ride,the boy turned and with his eyes shining,said,“Sir,would you mind driving in front of my house?”

Paul smiled a little.He thought he knew what the boy wanted.He wanted to show his neighbors that he could ride home in a big car.But Paul was wrong again.“Will you stop where those two steps are?”the boy asked.

He ran up to the steps.Then in a short while Paul heard him coming back,but he was not coming fast.He was carrying his little crippled(残疾的)brother.He sat down on the step and pointed to the car.

“There he is,Buddy,just like I told you upstairs.His brother gave it to him for Christmas and it didn’t cost him a cent.And some day I’m going to give you one just like it…then you can see for yourself all the nice things in the Christmas windows that I’ve been trying to tell you about”

Paul got out and lifted the boy to the front seat of his car.The shining-eyed elder brother climbed in beside him and the three began an unforgettable holiday ride.

小题1:The street urchin was very surprised when_______.

A.he met paul

B.Paul told him about the car

C.Paul received an expensive car

D.he was walking around the car小题2:From the story we can see the urchin________.

A.wished to give his brother a car

B.wanted Paul’s brother to give him a car

C.wished he could have a brother like Paul’s

D.wished Paul could be a brother like that小题3:The urchin asked Paul to stop his car in front of his house_______.

A.to show he had a rich friend

B.to show his neighbors the big car

C.to let his brother ride in the car

D.to tell his brother about his wish小题4:We can find from the story that_______.

A.the urchin wished Paul to give his car to Buddy

B.the urchin wished to have a rich brother

C.the urchin had a deep love for his brother

D.the urchin’s wish came true in the end

多项选择题