单项选择题
A．Tom is very responsible.
B．Tom’s words aren’t reliable.
C．What Tom said is true.
D．Tom is not humorous at all.
单项选择题 W: I thought Tom said he got As in all his tests.M: Mary, you should know better than to take Tom’s words too seriously.Q: What does the man mean?（）
单项选择题 M: Only one student in my class got above 90 points in the test. How about your class? Since there are more old students in your class, I’m sure they must have done a much better job.W: About 6 or 7 of them. But there are still some students who failed.Q: What can we infer from the conversation?（）
多项选择题 有（）情况之一时，不得排放瓦斯。