柴油发电机组由（）两部分组成。

根据短文内容，选择正确的选项。

The world itself is becoming much smaller by using modern traffic and modern communication means(交流方式). Life today is much easier than it was hundreds of years ago, but it has brought new problems. One of the biggest is pollution. To pollute means to make things dirty. Pollution comes in many ways. We see it, smell it, drink it and even hear it.

Man has been polluting the earth. The more people, the more pollution. Many years ago, the problem was not so serious because there were not so many people. When the land was used up or the river was dirty in a place, men moved to another place. But this is no longer true. Man is now slowly polluting the whole world.

Air pollution is still the most serious. It’s bad to all living things in the world, but it is not only one kind of pollution. Water pollution kills fish and pollutes drinking water. Noise pollution makes us become angry more easily.

Many countries are making rules to fight against pollution. They stop the people from burning coal in houses and factories in the city, and from blowing dirty smoke into the air.

The pollution of SO2 is now the most dangerous problem of air pollution. It is mostly caused by heavy traffic. It is certain that if there are fewer people driving, there will be less air pollution.

The earth is our home. We must take care of it. That means keeping the land, water and air clean. And we must try to control the growth of population at the same time.

小题1:Our world is becoming much smaller .

A．because the earth is being polluted day and night

B．because science is developing

C．because of the rise in population

D．because the earth is blown away by the wind every year小题2:Thousands of years ago, life was  it is today.

A．much easier than

B．as easy as

C．as hard as

D．much harder than小题3:Pollution comes in many ways. We can even hear it. Here “it” means .

A．water pollution

B．air pollution

C．noise pollution

D．rubbish小题4:What is the most dangerous problem of air pollution?

A．CO2

B．H2O

C．SO2

D．CO小题5:Air pollution is the most serious kind of pollution because .

A．it’s bad to all living things in the world

B．it makes much noise

C．it has made our rivers and lakes dirty

D．it makes us become angry more easily

下列物质必须隔绝空气和水蒸气保存的是（   ）

①Na ②Na₂O ③Na₂O₂ ④NaOH ⑤Na₂CO₃

A．①②

B．②③④⑤

C．①②③④

D．①②③④⑤

某施工队承包了某大学的地下管道铺设工程，在一条南北走向的通道上，挖了一条一米深的大沟，准备安装地下管道。施工队在开挖处的路段上，竖立了一个木牌，上写“此处施工，行人及车辆禁止通行”。一天晚上，张三骑车路过此处，因没有看见禁止通行的木牌而掉进沟里。后经他人相救送往医院，经查：张三左臂骨折以及其他部位的擦伤，共花医疗费749元，被迫休息一个月。张三找到施工队要求赔偿，遭到拒绝，张三即以施工队为被告起诉到人民法院，要求施工队赔偿医药费749元、自行车修理费60元、误工补助费610元，并承担本案诉讼费。 施工队辩称：在道路上挖沟进行施工是经过有关部门批准的，在开挖处也设立了标志。张三掉进沟里纯系他自己骑车不注意所造成的，施工队没有过错，也不应对张三的损失承担赔偿责任。 问：法院应如何判决理由是什么

接入Internet的方式有多种，下面关于各种接入方式的描述中，正确的是（）。

A．ADSL接入方式的上行、下行通道采用对称型的数据传输方式

B．通过PPP拨号方式接入，需要有固定的IP地址

C．通过HFC方式接入，每个用户独享信道带宽

D．通过局域网接入，可以有固定的IP地址，也可以用动态分配的IP地址

装配图中的（）以表达该机器（或部件）的工作原理、零件之间的装配关系和零件的主要结构形状。

A.一组图形

B.几类尺寸

C.技术要求

D.标题和明细