下列描述哪些属于时间分布：（）。A.森林脑炎见于春天 B.吸毒、不正当性行为可致艾滋

经典力学的产生归根结蒂是（   ）

A．生产力发展的结果

B．资本主义民主政治建立的结果

C．思想解放的结果

D．牛顿不懈努力的结果

钾、钠的测定方法有以下方法，除外（）

A.离子选择电极

B.电量分析法

C.火焰光度法

D.酶法

E.冠醚法

We often hear people talking about a generation gap (代沟). The name is new,but the idea is old. Young people and their parents don’t understand each other. The world has always kept changing. During the second century after Christ a wise man said, “Bury me on my face because in a little while everything will be turned upside down.”  There has always been a gap between generations, but more people talk about it now. Old Mr. Ellis thinks he understands what has happened. “When I was a boy, I thought the world was a beautiful place. My life was very pleasant. But when I was older, I learned about people who were treated badly, people who didn’t have enough to eat. I wanted to help them, and I married a girl who wanted to help them, too. We went to meetings and talked a lot, but it didn’t seem to make much difference. ”“Our children grew up in a world at war. They didn’t know when the fighting would stop. They wanted their children to have nice clothes and toys. They didn’t want to think about the future. They thought nothing could be done about it.” “Now I have grandchildren, and they have their own ideas. They are trying to make the world better. They are trying to help other people. They’re making people listen to them. I am proud of their generation.”

小题1: The wise man mentioned in the text told people to bury him on his face so   that when everything is turned upside down he will _____.

A．lie on his stomach

B．lie on his back

C．stand quietly

D．sit in peace小题2:Which generation did NOT want to do anything to make the world a better one?

A．Mr. Ellis’ generation

B．His children’s generation

C．His grandchildren’s generation

D．None of the above.小题3: What is the writer’s attitude towards the generation gap?

A．Unacceptable.

B．Awful.

C．Funny.

D．Common.

制作轴类零件、齿轮、弹簧、轴承等用到的钢材属于（）。

A.合金钢

B.特殊性能钢

C.机器零件结构用钢

D.工程构件结构用钢

恢复系