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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
【简答题】It is d______ to skate on such thin ice.
【简答题】英国的网络域名定为 A ..com B..gov C..uk D..edu
【单选题】He looks thin, but he is _____ than before. [ ]
A.
thinner
B.
more thin
C.
more strong
D.
stronger
【单选题】How often are the Nobel prizes awarded?
A.
Five times a year.
B.
Once a year.
C.
Twice a year.
D.
Once every two years.
【简答题】A．Less than a year. B．Only a week. C．More than a year. D．Two weeks and a year.
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