问题 选择题

下列说法中正确的是(  )

A.有电源存在,电路中一定会形成电流

B.导体的电阻越大,通过的电流一定越小

C.导体的电阻只与导体的长度和材料有关

D.家庭电路中,开关与用电器之间是串联的

答案

A、电源是提供电压的装置,但电路中形成电流必须还具备电路是闭合的,故说法不正确,不符合题意;

B、导体中的电流跟导体两端的电压和导体的电阻都有关.导体的电阻越大,通过的电流一定越小,必须是在电压一定时;故说法不正确,不符合题意;

C、电阻为导体一种属性,其大小取决于导线长度、粗细及导体的材料;故导体的电阻只与导体的长度和材料有关的说法错误,不符合题意;

D、根据串联电路的特点可知,开关与其所控制的用电器要串联,则该项说法正确,符合题意;

故选D.

阅读理解

Many people say that they are working too many hours. They don't have enough time to relax or to stay with their family.

Work hours are different from one country to another. In France, people spend about 1,646 hours a year at work. In Japan, however, people work about 2,159 hours a year. That means a Japanese worker works 513 more hours a year than a French worker.

Why do people work so many hours? Some people work extra hours because they want to make more money. However, many companies don't pay overtime. Their workers don't get more pay for more work. Some people think it's their duty to work more hours. Some are afraid of losing their jobs if they don't work more hours.

Many people say that their vacations are too short. In France, people get five weeks of paid vacation a year. In Germany, they get four to six weeks, and in the United States, two weeks. One study shows fewer than half of workers used all their vacation days. In Great Britain, there is a saying, "All work and no play makes Jack a dull (迟钝的) boy." If that is true, there must be a lot of dull people in the world.

小题1:A Japanese worker works __ more hours a year than a French one.

A.513

B.1,646

C.2,159

D.3,805小题2:The word "extra" in Paragraph 3 means ".

A.正常的

B.额外的

C.有用的

D.少量的小题3:People in ________ get only two weeks of paid vacation a year.

A.France

B.Germany

C.the United States

D.Great Britain小题4:Which of the following is true according to the passage?

A.No companies offer vacations to their workers.

B.Many people say they have enough time to relax.

C.Not all companies pay their workers for more work.

D.More than half of workers use all their vacation days.小题5:What can we infer from the passage?

A.Many workers have to work long hours.

B.Many people have vacations long enough.

C.Work hours are the same around the world.

D.There are a lot of dull people in the world.

选择题