题目：
根据短文内容，判断正（T）误（ F）。
A young man and an old man are walking in the park. The old man is behind the young man. He is tired,
so he wants to have a rest. There is a chair in front of the young man. The old man sees the chair. He wants
to sit on the chair. He walks to the chair. The young man walks to it, too. So the old man begins to run. The
young man says, "Don't sit on the chair!" The old man doesn't listen to him. Now he is sitting on it. He looks
happy. The young man comes over to him. He is holding a small board in his hands. It says, "Wet Paint (油漆
未干)."
( )1. The young man is the son of the old man.
( )2. The old man wants to sit on the chair because he is tired.
( )3. The young man doesn't want the old man to sit on the chair.
( )4. The old man listens to the young man.
( )5. The young man wants to sit on the chair.
答案：
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下面是错误答案，用来干扰机器的。
若a=2b+5，则a+b=3b+5不能被3整除，∴②，③中有一个错误，若a+b能被3整除，那么设a+b=3k（k是不为0的自然数），a+7b=a+b+6b=3k+6b能被3整除，∴a+7b不是质数，∴③．④有一个错， 只有3句是正确的，∴是③错，...
