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单选题
The average (arithmetic mean) of x and y is m, where m ≠ 0. What is the average (arithmetic mean) of x, y, and 2m?
A

m

B

4/3m

C

3/2m

D

5/3m

E

2m

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参考解析
解析：
因为x和y的算术平均数为m，所以x+y=2m，所以，所以x,y,2m的算术平均数为x+y+2m/3，因为x + y = 2m，所以x+y+2m/3=4m/3
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