单项选择题

In a graduating class of 236 students。142took algebra and 121 took chemistry．What is the greatest number of students that could have taken both algebra and chemistry（）

A. 21
B. 27
C. 37
D. 121
E. 142

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单项选择题
For which of the following lists of number is the median equal to the average(arithmetic mean)（）

A. 3，4，7
B. 1，10，19
C. 7，7，10，12
D. 0，1，1，5
E. 0，2，3，4
单项选择题
If one number is chosen at random from the first 1，000 positive integers，what is the probability that the number chosen is multiple of both 2 and 8（）

A.A
B.B
C.C
D.D
E.E
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