问题 选择题

如图所示,质量分别为mA和mB的物体A、B用细绳连接后跨过滑轮,A静止在倾角为45°的斜面上,B悬挂着,已知mA=2mB,不计滑轮摩擦,现将斜面倾角由45°增大到50°,系统保持静止,下列说法正确的是

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A.绳子对A的拉力将增大

B.物体A对斜面的压力将减小

C.物体A受到的静摩擦力不变

D.物体A受到的合力将增大

答案

答案:B

单项选择题
阅读理解

Once there was a king who never ate a meal unless there was a dish of fish with it, but one day there was a big storm and the fishermen were not able to go out to catch fish, so the king had no breakfast and no lunch. Then he ordered his servants to tell everybody in his capital that if anyone brought him a fish, he would give him anything that he asked for.

At last, a fisherman caught a big fish late in the afternoon and hurried to the king's palace with it. But the king's Prime Minister would not let him in until he promised to give him half of whatever the king gave him for the fish.

The king was very happy when he saw the fish. He asked the fisherman what he wanted for his fish. To his surprise, the fisherman said, "I want you to beat me two dozen(一打) times with a stick." When the king began to beat him a dozen times, the fisherman jumped away and said, "That is enough for me. I promised the other dozen to your Prime Minister." Then he told the king what had happened between the Prime Minister and himself. The king was very angry. He not only gave the Prime Minister the dozen hits, but also said, "Because you have been dishonest, you will not be my Prime Minister any more. The fisherman will take your place."

小题1:The king didn't have breakfast and lunch because ____.

A.there was a big storm

B.the Prime Minister did not bring him any food

C.there was no fish

D.his servants didn't know how to cook well小题2:. The fisherman took his fish to the king's palace because ____.

A.the king had promised to give him whatever he wanted

B.the king was dying from hunger

C.he wanted to teach the Prime Minister a lesson

D.he wanted to be the Prime Minister小题3:. When the fisherman told the king what he wanted, the king ____.

A.was very happy

B.was very surprised

C.was very angry

D.gave him what he wanted at once小题4:. The king got rid of his Prime Minister because ____.

A.the fisherman was cleverer than his Prime Minister

B.the Prime Minister did not know how to catch fish

C.the Prime Minister was not an honest man

D.the Prime Minister took half of what the king gave the fisherman