题目内容

Questions 13 to 15 are based on the conversation you have just heard.

A. He has a meeting. B. He’s going out of town.
B. C. He’ll be getting his car fixed. D. He has to do some work then.

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已知Y=lnX~N(μ,σ2),求X的概率密度.

How can the men be dressed in the restaurant Very ______.

Questions 9 to 12 are based on the conversation you have just heard.

A. In the morning.
B. During lunch.
C. In the afternoon.
During dinner.

Questions 11 to 18 are based on the conversation you have just heard.

A. One student received a higher grade than he did.
B. He will have to take a number of exams later.
C. The test is more difficult than he expected.
D. Several students in his class have received top grades.

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