问题 选择题

在“绿色化学”工艺中,理想状态是反应物中原子全部转化为欲得到的产物,即原子的利用率为100%,从根本上减少或杜绝污染。在催化剂作用下,如果用丙炔(C3H4)合成2一甲基丙烯酸甲酯(C5H8O2),欲按照“绿色化学”要求,还需要的其他反应物是[ ]

A.CH3OH

B.CO2和H2

C.H2和CO

D.CO2和CH3OH

答案

答案:C

阅读理解

One day a young man went to the town and bought himself a new pair of pants. When he got home, he went to his room and put them on. He found they were about two inches(英寸) long. He went into the kitchen(厨房). His mother and his two sisters were doing some washing there. He said to them,“ The new pants are too long. They need cutting(剪) by two inches. Would one of you do this for me?” His mother and sisters were busy and nobody said anything.

But after his mother finished washing, she went to her son’s room and cut the pants by two inches. She came back without saying anything to her daughters. After supper, the elder sister remembered her brother’s pants. She went to his room and cut the pants by two inches without saying anything to anyone. The younger sister went to the cinema. But when she came back, she also remembered her brother’s pants, so she went to his room and cut them by two inches, too.

小题1:The pants were       .

A.too long

B.new

C.for the young man

D.A, B and C小题2:The young man’s mother and sister didn’t answer him because         .

A.they don’t like him at all

B.they were too busy at that time

C.they didn’t want to do it for him

D.they didn’t hear him clearly小题3:If the pants were 197 inches at first, at last they were        .

A.191 inches

B.193 inches

C.195 inches

D.199 inches小题4:From the story, we know        .

A.The young man’s mother and sister didn’t want to help him.

B.The young man can wear the pants to go out now.

C.The young man can cut his pants himself.

D.The young man wouldn’t be very happy after he saw his pants.小题5:Which one is true from the story?

A.The young man’s mother and sisters wouldn’t like to talk with each other.

B.The young man’s mother and sister didn’t hear the young man’s words.

C.The young man’s pants were too long for him now.

D.The young man had to buy another pair of pants now.

单项选择题