问题 选择题

如图所示:等温时,a、b容器开始体积相等,各充入等量的SO3(g),则平衡时SO3的转化率大小关系是(  )

A.a>b

B.a<b

C.a=b

D.无法确定

答案

充入SO3(g)后发生反应2SO3(g)?2SO2(g)+O2(g),气体的物质的量增大,a容器内压强比b容器内高,a容器相当于在b容器的基础上增大压强,平衡逆向移动,SO3的转化率降低,故a<b,

故选B.

阅读理解

We were on our way home from Houston one Saturday morning. We decided to stop at a local gas station to get coffee and something to snack on since it was a good hour and a half before we got home.

When we were done, we got back into our car and before I started it, we noticed a man standing outside in front of the building. He was a homeless man with worn clothes and it looked like he had gone in and gotten himself some coffee or something warm to drink since it was cold this time of the year. He must have not had enough money to get something to eat.

Then a dog walked up to the front of the building. I could tell she was a “she”, because you could tell that she had baby dogs. She was terribly in need of something to eat and I felt so bad for her. I knew if she didn’t eat soon, she and her baby dogs would not make it.

I and my wife sat there and looked at her. We noticed that people walked by and didn’t even pet her, like most people do when they walk by an animal in front of a store. We still did not do anything. But the homeless man, who I thought did not buy himself anything to eat, went back into the store. And what he did brought tears to me and my wife. He had gone into the store and with what money he may have had, bought a can of dog food and fed that dog.

This story plays a great part in our lives. You see, that was Mother’s Day weekend. And a lot of people forget that some animals are parents too.

It took a homeless man, to show me what I should have done. He make me a better man that day.

小题1: The homeless man only had something to drink because _______.

A.he didn’t have enough money for food

B.he was thirsty only

C.the store only provided drinks

D.he felt cold that day小题2: Seeing what the poor man did for the dog, the author and his wife ________.

A.were puzzled

B.were greatly moved

C.regretted they hadn’t done anything

D.were indifferent小题3: If the homeless man hadn’t given the dog food to eat, she and her babies would ________.

A.not survive

B.have to attack people

C.not have to die

D.lose their homes小题4:Which of the following is the most suitable title for this passage?

A.A kind Homeless Man

B.A Lucky Mother Dog

C.Mother Day’s Weekend

D.Animals Are Parents Too

单项选择题