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【单选题】
设F 1 （x）与F 1 （x）分别为随机变量X 1 与X 2 的分布函数，若函数F（x）=aF 1 （x）-bF 2 （x）是某随机变量的分布函数，则必有（）A.
a=3/5，b=-2/5
B.
a=-3/5，b=2/5
C.
a=1/2，b=3/2
D.
a=1/2，b=-3/2
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举一反三
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A.
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B.
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C.
don't have
D.
aren't have
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A.
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B.
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C.
He does not like the music lessons.
【单选题】In the text of Hidden Lessons, the author is astonished at how children in urban settings are taught to see nature as dangerous, or as a nuisance.
A.
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B.
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