问题 探究题

为了探究甲、乙两种物质的导电性能好坏,小春同学连接了如图所示的电路,其中A、B两个接线柱是用来接入待测物质的.

(1)实验中,应保持电源的_________不变;

(2)要比较物体导电性能的强弱,可通过观察图中的_________来判断;

(3)在A、B两点间分别接入甲、乙两种物质后,电流表的示数分别为0.1 A和0.5 A,则导电性能好的是_________物质.

答案

(1)电压;

(2)电流表示数大小;

(3)乙.

阅读理解

阅读理解。

     Information has always been at the center of human communication.Yon may ask why.Well,

communication between people contains giving and receiving information. The way we give and receive

information today has experienced a revolution in the development of the mass media in the 20th century.

     The first truly mass communication medium was the newspaper. For the first time in history people

could read about events in their country and from around the world every day. However there were two

problems with newspapers of that time. Firstly, newspapers were available only in large cities, for getting

newspapers to the countryside was a difficult and timeconsuming (耗时的) task. Secondly, newspapers

weren't always reliable, as there was a limited range of opinions.

     Nowadays, we can choose from a wide variety of sources to get information. Television and the

Internet have given us the chance to be informed about everything the minute it happens. Large numbers of radio and TV stations, satellite channels and millions of websites help people keep up with the latest news.People live in history and are part of it.

     The media have come a long way in the last century and there is no doubt that we now live in the

information age. Whatever type of media we choose, it all comes down to the need for information.This

will always be a basic need as long as communication is part of human nature.

1. Information is considered the center of human communication because_____.

A. human communication means information exchange

B. human communication involves people's participation

C. information is now experiencing a revolution

D. information helps people gather together

2. What was the historical contribution of the newspaper as a source of information?

A. It made the mass communication truly develop.

B. It helped the mass communication develop in cities.

C. It kept people timely informed about home and world events.

D. It kept reliable information available in big cities.

3. The third paragraph mainly tells us that technology helps_____.

A. information easily available

B. people be part of history

C. inform everything timely

D. produce the latest news

4. It can be concluded from the last paragraph that a basic need today is_____.

A. communication  

B. information

C. high technology  

D. media types

单项选择题