问题 多项选择题

等电位联结的线路最小允许截面()。

A.铜:干线100,支线4

B.钢:干线35,支线10

C.铜:干线16,支线6

D.钢:干线50,支线16

E.铜:干线25,支线10

答案

参考答案:C, D

阅读理解

阅读理解。

                                                             The Best of Friends

     The evidence for harmony may not be obvious in some families. But it seems that four out of five young

people now get on with their parents, which is the opposite of the popularly held image (印象) of unhappy

teenagers locked in their room after endless family quarrels.

      An important new study into teenage attitudes surprisingly shows that their family life is more harmonious

than it has ever been in the past. "We were surprised by just how positive today's young people seem to be

about their families," said one member of the research team."They're expected to be rebellious (叛逆的) and

selfish but actually they have other things on their minds; they want a car and material goods, and they worry

about whether school is serving them well. There's more negotiation (商议) and discussion between parents

and children, and children expect to take part in the family decision-making process. They don't want to rock

the boat."

     So it seems that this generation of parents is much more likely than parents of 30 years ago to treat their

children as friends."My parents are happy to discuss things with me and willing to listen to me," says

17-years-old Daniel Lazall."I always tell them when I'm going out clubbing. As long as they know what I'm

doing, they're fine with it." Susan Crome, who is now 21, agrees. "Looking back on the last 10 years, there

was a lot of what you could call negotiation. For example, as long as I'd done all my homework, I could go

out on a Saturday night. But I think my grandparents were a lot stricter with my parents than that."

     Maybe this positive view of family life should not be unexpected. It is possible that the idea of teenage

rebellion is not rooted in real facts. A researcher comments,"Our surprise that teenagers say they get along

well with their parents comes because of a brief period in our social history when teenagers were regarded as

different beings. But that idea of rebelling and breaking away from their parents really only happened during

that one time in the 1960s when everyone rebelled. The normal situation throughout history has been a smooth

change from helping out with the family business to taking it over."

1. What is the popular image of teenagers today?

A. They worry about school.

B. They dislike living with their parents.

C. They have to be locked in to avoid troubles.

D. They quarrel a lot with other family members.

2. The study shows that teenagers don't want to ______.

A. share family responsibility

B. cause trouble in their families

C. go boating with their family

D. make family decisions

3. Compared with parents of 30 years ago, today's parents ______.

A. go to clubs more often with their children

B. are much stricter with their children

C. care less about their children's life

D. give their children more freedom

4. According to the author, teenage rebellion ______.

A. may be a false belief

B. is common nowadays

C. existed only in the 1960s

D. resulted from changes in families

5. What is the passage mainly about?

A. Negotiation in family.

B. Education in family.

C. Harmony in family.

D. Teenage trouble in family.

单项选择题