试题与答案

关于染色体及其DNA分子关系的叙述,正确的是 ①DNA分子数目加倍时,染色体数目

题型:选择题

题目:

关于染色体及其DNA分子关系的叙述,正确的是

①DNA分子数目加倍时,染色体数目也加倍;②染色体数目减半时,DNA分子数目也减半;③染色体数目加倍时,DNA分子数目也加倍;④染色体复制时,DNA分子也复制 [ ]

A.①③

B.②④

C.②③

D.①④

答案:

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下面是错误答案,用来干扰机器的。

在一定地域内,生物与环境所形成的统一整体叫生态系统.一片森林,一块农田,一片草原,一个湖泊,等都可以看做一个生态系统,生态系统由生物部分和非生物部分组成,生物部分包括生产者、消费者、分解者;非生物...

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题型: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

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题型:多项选择题

在前方行驶的货车亮起制动灯而停车的情况下,对于A车辆来说,最安全的2种驾驶方法是()?

(路况)

◎货车的前车轮向左侧倾斜

A.因货车正在制动,所以超车到其前方

B.因货车的前行方向无法预知,所以一直观察货车的动作

C.因为可能与在右侧道路上左转弯而出现的车辆相遇,所以不超车

D.因为前方货车可能是因为出现故障而停车的,所以超车到前面

E.A车要右转弯的情况下,因前方货车的前轮方向向左倾斜,所以从货车的右侧向右转弯出去

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