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【单选题】
关于泊松分布，错误的有A.
二项分布中，n很大，π根小，则可用泊松分布近似二项分布
B.
泊松分布由均数唯一确定
C.
泊松分布的均数越大，越接近正态分布
D.
泊松分布的均数与标准差相等
E.
如果x1服从均数为μ1的泊松分布，x2服从均数为μ2的泊松分布，则x1＋x2服从均数为μ1＋μ2的泊松分布
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【简答题】Mary told me not to worry because the (operate) ______on Mr.Smith was very successful.
【单选题】—Tom, may I borrow your book Chicken Soup? —Sorry, I ____ it to Mary. [ ]
A.
lent
B.
have lent
C.
had lent
D.
lend
【简答题】阅读理解。 I'm daydaytest Placeholder! Mr. Smith never watched TV. He thought that people spent too much time watching it. Some of his friends often talked about sports shows, the movies and plays. Mr....
【单选题】．—____ —Sorry, I don’t know．
A.
Have you seen Mr．Smith?
B.
Where has Mr．Smith gone?
C.
How about Mr．Smith?
D.
Hello, Mr．Smith．
【简答题】A．Because books could be lent to everyone. B．Because books could be lent at no costs. C．Because books were lent to students and faculty. D．Because books were lent on a paid membership basis.
【简答题】, lent, lent
【单选题】Mr.Smith lent as much money as possible to his friends _____he wasn’t very rich.
A.
as
B.
though
C.
since
D.
because
【单选题】He ___ some books ___ me, and never gave them back. [ ]
A.
lent, to
B.
lent, from
C.
borrowed, to
D.
borrowed, from
【简答题】100个初级精母细胞经过减数分裂后可形成( )个精子;100个初级卵母细胞经过减数分裂可形成( )卵细胞。(以动物为例)
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