问题 选择题

关于运动和力,下列说法中正确的是( )

A.物体不受外力作用时,一定保持匀速直线运动状态

B.物体不受外力作用时,一定保持静止状态

C.物体的运动状态发生改变时,它一定受到外力作用

D.力是使物体保持运动的原因

答案

答案:C

物体不受外力作用时, 保持匀速直线运动状态或静止状态,故AB均错误;

力是改变物体运动状态的原因,不是维持物体运动的原因,故C正确,D错误;

所以选C

阅读理解

阅读理解。

     Mr. Jones and Mr. Brown worked in the same office. One day Mr. Jones said to Mr. Brown, "We

are going to have a small party at our house next Wednesday evening . Would you and your wife like to

join us?"

     Mr. Brown said, "Thank you very much . That is very kind of you. We are free that evening. I think,

but I will telephone my wife and ask her. Maybe she wants to go somewhere else that evening." So Mr.

Brown went to the other room and telephoned. When he came back, he looked very sorry.

     "What is the matter?" said Mr. Jones. "Did you speak to your wife?"

     "No," answered Mr. Brown, "She wasn't there, my small son answered the telephone. I said to him,"

Is your mother there, David?' and he answered, 'No, she is not in the house,' 'Where is she then?' I asked. 'She is somewhere outside.' 'What is she doing?' 'She is looking for me.'"

1. A small party will be held ______.

A. at David's house

B. at Mr. Brown's house

C. in the office

D. at Mr. Jones' house

2. Mr. Jones asked ______to the party.

A. Mr. Brown

B. Mrs. Brown

C. Mr. and Mrs. Brown

D. all his friends

3. The telephone was ______.

A. in the same office

B. in a room next to the office

C. in the post office

D. near Mr. Jones' house

4. Mr. Brown spoke to ______on the phone .

A. Mrs. Brown

B. Mrs. Jones

C. David

D. David's friend

5. Why was Mrs. Brown looking for David? Because ______.

A. he went out of the house

B. he was answering Father's phone

C. she knew David had lost his way

D. she thought he was playing somewhere outside

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