问题 多选题
如图所示,理想变压器原线圈接u=220sin100πt (V)的 正弦交流电源,图中电流表内阻不计.副线圈接入“110V,60W”灯泡一只,且灯光正常发光.下列说法正确的是(   )

A.电流表的示数为3/11 A

B.通过灯泡的电流的频率为50Hz

C.电流表的示数为3/22 A

D.理想变压器原、副线圈匝数之比为2:1

答案

AB

阅读理解

第二部分阅读理解(共分两节,满分45分)

阅读理解(共20小题;每小题2分,满分40分)

阅读下列短文,从每题所给的四个选项A、B、C、D中,选出最佳选项,并在答题卡上将该项涂黑。

A

Have you ever heard the story of the four-minute miles? Many years ago, people believed that it was impossible for a human being to run a mile in less than four minutes until Roger Banister proved it wrong in 1954.

What happens if you put an animal in a pond? Any animal, big or small, will swim its way through. What happens when someone, who doesn’t know how to swim, falls in deep waters? They drown. If an animal who has not learnt swimming could escape by swimming, why not you? Because you believe you will drown while the animal doesn’t.

Have you ever wondered why the letters are organized in a particular order on your keyboard? You might have thought it is to increase the typing speed. Most people never question it. But the fact is that this system was developed to reduce the typing speed at a time when typewriter parts would jam (堵塞) if the operator typed too fast.

These three cases show the power of our beliefs. There is no other more powerful directing force in human behavior than belief. Your beliefs have the power to create and to destroy. A belief delivers command to your nervous system.

I used a snake in my workshops for children to show them how unrealistic some of their beliefs are. Students of a school in India, said snakes are smooth and poisonous. After doing an exercise for changing beliefs, they handled my snake and found it to be dry and clean. They also remembered that only three types of poisonous snakes exist in India.

Did this story end the way you thought? Review your beliefs now and find out which ones you need to change.

41. In author’s opinion, if a person in deep water doesn’t know how to swim, he will drown because ______.

A. he is afraid of water.                          B. he hasn’t learnt to swim before.

C. he believes he will drown.                         D. he don’t want to live in the world.

42. The author thinks that the letters organized in a particular order on your keyboard in order to ________.

A. save more space                           B. satisfy the operator

C. increase one’s typing speed                  D. reduce one’s typing speed

43. The author’s experiment shows that ________.

A. snakes can be caught easily                 B. snakes are dry and clean

C. snakes are smooth and poisonous                    D. snakes in India aren’t poisonous

44. The main idea of this passage should be that ________.

A. beliefs are very powerful.                            B. beliefs make us seem stupid

C. changing your beliefs now is necessary           D. people should always believe in themselves.

单项选择题