问题 单项选择题

如图所示,A、B两物体叠放在一起,用手托住,让他们静靠在墙边,然后释放,它们同时沿竖直墙面向下滑,已知mA>mB,则物体B()

A.只受一个重力

B.受到重力和一个摩擦力

C.受到重力、一个弹力和一个摩擦力

D.受到重力、一个摩擦力、两个弹力

答案

参考答案:A

阅读理解

Prana was a beautiful dog, whose name means “breath of life”. Although he died several years ago, I can still remember the days we spent together and what he has taught me about love.

I have two apple trees in the garden. Prana loved apples. When he went outside, he’d catch an apple and take it into the house to eat later. The apples had been on the ground and were often dirty so I wasn’t always happy that Prana had brought them into the house.

It was an autumn day in America, but it was very cold. A big snow fell and we had not done anything for its coming. On that special day, Prana went outside and I watched him through the window. I noticed that he was madly digging(挖) holes and bringing the apples to the ground so they could be seen above the snow. I did not know why he was doing this. He seemed to want to do something special.

When I called him back, he had his usual one apple in his mouth. About five minutes later, I looked outside. The garden was completely covered with birds. Prana had dug up all those apples for his bird friends to eat. He knew that they wouldn’t have stored enough food for the coming winter!

小题1:Prana was                .

A.the writer

B.a boy

C.a bird

D.a dog小题2:I wasn’t always happy because                .

A.Prana loved apples

B.Prana caught an apple and ate it

C.the apples fell on the ground and were dirty

D.Prana brought the dirty apples into the house小题3:On the snowy day, Prana               .

A.ate up all the apples

B.dug holes to put the apples in them

C.brought the apples under the snow to the ground

D.left the house and died小题4:The birds flew to the garden to                .

A.look for Prana

B.eat the apples

C.make new homes

D.store food for the winter小题5:The topic of the story is about                .

A.apples

B.animals

C.love

D.life

名词解释