试题与答案

如图所示,a、b灯分别标有“36 V,40 W”和“36 V,25 W”,闭合电

题型:选择题

题目:

如图所示,ab灯分别标有“36 V,40 W”和“36 V,25 W”,闭合电键,调节R,使ab都正常发光。这时断开电键后再次闭合,则下列说法中正确的是( )

A.重新闭合瞬间,由于电感线圈对电流增大的阻碍作用,a将慢慢亮起来,而b立即变亮

B.重新闭合稳定后,两灯都正常发光,a的额定功率大,所以较亮

C.断开瞬间,由于电感线圈对电流减小的阻碍作用,通过a的电流将逐渐减小,a渐渐变暗到熄灭

D.断开瞬间,b灯立刻熄灭

答案:

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题型:阅读理解

Reading comprehension.

     There was once a very bad king. All the people hated him. One hot day the king was walking along the

river.He decided to take a swim. The king was a good swimmer, but when he got into the water, he suddenly

felt a pain in his side. He started to drown.

     Two farmers were working in a field nearby. They jumped into the water and saved him. They didn't know

that he was the king until he was out of the water. The king was very grateful to the farmers. He said to them,

"You have saved my life. Ask me for anything you want." One of the farmers said, "I need two water buffaloes

to help me in the fields." The king promised he would give him the animals.

     Then the king asked the other farmer, "What is your wish?" The other farmer was old and wise. He thought

and thought. Then he said, "Don't tell anyone that I helped to save your life."

Judge the following sentences true (T) or false (F).

( )1. The wise farmer was very glad that he saved the king.

( )2. The farmers didn't know how to swim.

(     )3. The king didn't know how to swim.

(     )4. One farmer asked for two animals.

(     )5. Everyone hated the king.

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