问题 填空题

如图甲所示,压路机的车轮做成圆柱形,是为了在压力相等的情况下,减小受力面积,增大__________;如图乙所示,用吸管吸饮料,使饮料流入嘴里的力是_________.

答案

压强,大气压力

(1)压路机制成圆柱型是为了在压力一定时,减小受力面积,增大对地面的压强.

(2)喝饮料时,用力吸气,增大了气体的体积,管内压强减小,饮料在大气压的作用下进入吸管.饮料受到的向上的力是大气压力.

完形填空

When I was a baby, I entertained you and made you laugh. Whenever I was “bad”, you'd shake your finger at me and ask, “How could you?”--but then you'd give up, and roll me over for a belly scratch and I believed that life could not be any more perfect.

My housetraining was a long process, because you were terribly busy, but we worked on that together. We went for long walks, runs in the park and car rides. We stopped for ice cream. I took long naps in the sun waiting for you to come home at the end of the day.

Gradually, you began spending more time at work and on your career, and more time searching for a human mate. Eventually, you fell in love. She, now your wife, is not a dog person, but I still welcomed her into our home. I was happy because you were happy. Then the human babies came along and I shared your excitement, I was fascinated by their pinkness, how they smelled, and I wanted to mother them too. Your wife was afraid I would bite them. But nevertheless, as they began to grow, I became their friend.

Now, you have a new job in another city and you and they will be moving to an apartment that does not allow pets. You've made the right decision for your “family”, but there was a time when I was your only family.

I was excited about the car ride until we arrived at the dog pound. It smelled of dogs and cats, of fear, of hopelessness. You filled out the paperwork and said, “I know you will find a good home for her.” They shrugged and gave you a pained look. The children were in tears as they waved me goodbye. And “How could you?” were the only three words that swept over my mind.

Is it better to live with hope or without hope? At first, whenever anyone passed my pen (围栏), I rushed to the front, hoping it was you, that you had changed your mind and that this was all a bad dream.

My beloved master, I will think of you and wait for you forever. I hope you receive more faithfulness from your family than you showed to me.

小题1:Who tells this story?

A.A dog.

B.A child.

C.A dog's owner.

D.A dog trainer小题2:Why did the dog's owner take his dog to the pound?

A.He had a newborn baby.

B.His wife did not like the dog.

C.He was moving into a new building.

D.He thought the dog too troublesome.小题3:Which is true about the dog when it lived at the pound?

A.It hoped to be adopted by another family.

B.It continued to love its former owner.

C.It did not trust humans any more.

D.It was excited about the pound.小题4:What is the theme of the story?

A.Be ready for changes.

B.Never expect too much.

C.Never complain about your life.

D.Be faithful to those who love you.

单项选择题