问题 单项选择题

DNA是主要的遗传物质是指()

A.遗传物质的主要载体是染色体

B.绝大多数生物的遗传物质是DNA

C.细胞里的DNA大部分在染色体上

D.染色体在遗传上起主要作用

答案

参考答案:B

解析:DNA是主要的遗传物质是因为绝大多数生物的遗传物质是DNA,B正确。染色体仅仅是DNA的主要载体,保证生物在传种接代过程中遗传物质保持相对稳定。

阅读理解

Television has a huge influence on our lives. It is one of the most important ways of getting information. People spend part of their spare time watching television, and much of what they learn comes from it.

What we see on TV—movies, news shows, sports shows, advertisements and so on have increased our knowledge and have changed the way we learn about the world today. However, not everything on TV is true.

Most of the viewers are children. Television sometimes is like a baby-sitter. It spends more time with children than parents do. But it keeps them in the living room away from healthy outdoor activities. They spend less time playing soccer or walking in the park or playing games in the yard.

Of course, there are some programs on TV that are good for children. But there are also some shows which are bad. Children should not watch unhealthy shows. Maybe we can’t change what is on TV, but we can choose what we watch. Do you agree?

小题1:Why is television sometimes like a baby-sitter?

A.Because television can take care of children.

B.Because children spend more time watching TV than staying with their parents.

C.Because television spends time looking after children.

D.Because television keeps children from going out.小题2:Which is not one of the good influences television has on our lives?

A.It stops children from attending healthy outdoor activities.

B.It provides a lot of information.

C.It changes people’s way of learning.

D.It increases people’s knowledge.小题3:We can learn from the passage that _________.

A.parents shouldn’t let children watch TV

B.We should believe everything on TV.

C.we can choose TV programmes

D.parents shouldn’t watch TV小题4: What’s the writer’s attitude(态度) towards television?

A.消极的

B.积极的

C.中立的

D.愤怒的小题5:The passage is mainly about ________.

A.children spend too much time watching TV

B.people spend their time on TV for information

C.TV programmes attract children

D.the great influence TV has on our lives

单项选择题