问题 解答题

判断由下列命题构成的p∨q,p∧q,非p形式的命题的真假:

(1)p:负数的平方是正数,q:有理数是实数;______

(2)p:2≤3,q:3<2;______

(3)p:35是5的倍数,q:41是7的倍数.______.

答案

(1)p真,q真,∴p∨q为真命题,p∧q为真命题,非p为假命题;

(2)p真,q假,∴p∨q为真命题,p∧q为假命题,非p为假命题;

(3)p真,q假,∴p∨q为真命题,p∧q为假命题,非p为假命题.

故答案为:(1)p∨q为真命题,p∧q为真命题,非p为假命题.

(2)p∨q为真命题,p∧q为假命题,非p为假命题.

(3)p∨q为真命题,p∧q为假命题,非p为假命题.

阅读理解

One day, there was a blind man called John sitting on the bench(长条椅)with a hat by his feet and a sign that read,“I am blind. Please help me.”

A creative publicist(广告员) named Tom was walking by the blind man and stopped to see that the man only had a few coins in his hat. He put a few of his own coins in the hat. Without asking for permission, he took the sign, turned it around and wrote a new message. Then he put the sign by the feet of the blind man, and left.

Later that afternoon the publicist returned to the blind man and noticed that his hat was almost full of bills and coins. The blind man recognized(认出,识别出)his footsteps and asked if it was he who had changed his sign. He also wanted to know what the man wrote on it.

The publicist said,“I just wrote the message a little differently.”He smiled and went on his way.

The new sign read,“Spring has come, but I can’t see anything.”

小题1:What’s the blind man’s name?

A.Tom.

B.John.

C.Tony.

D.Sorry, I don’t know.小题2:Who wrote a new message?

A.The blind man.

B.The teacher.

C.The publicist.

D.The farmer.小题3:How did the blind man recognize the publicist?

A.By his sign.

B.By his footsteps.

C.By his voice.

D.By his coins.小题4:When did the story happen?

A.In spring.

B.In summer.

C.In autumn.

D.In winter.小题5:What can we learn from the passage?

A.Publicists are always friendly and helpful.

B.We can get more money by changing a sign.

C.The blind man was very stupid, so he had little money.

D.The power(力量)of language is great.

多项选择题 案例分析题