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【单选题】
Excuse me, but could you tell me _______?A.
what is your name
B.
how I can call this young lady
C.
what is the matter with you
D.
how long the dog has died
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举一反三
【单选题】Mary used to early, but now she doesn't.
A.
get up
B.
getting up
C.
got up
D.
gets up
【单选题】Mary used to take _______ advantage of the lunch hour to have _______ short sleep in her office.
A.
/; the
B.
the; the
C.
the; a
D.
/; a
【简答题】设随机变量 服从参数为2的泊松分布,试用切比雪夫不等式估计 的大小为
【简答题】设随机变量 服从参数为2的泊松分布,且 , 则 (__);
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