选择题：The ____________driver was seriously hurt in the t

题目内容：

The ____________driver was seriously hurt in the traffic accident.
选择一项：
A. 40-years-old
B. 40-year-old
C. 40 year old

参考答案：

设X1,X2,X3相互独立,且均服从参数为λ的泊松分布,令Y=(x1+x2+X3),则y2的数学期望

设X1,X2,X3相互独立,且均服从参数为λ的泊松分布,令Y=(x1+x2+X3),则y2的数学期望为()I =

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The couple was ____________that they couldn.t drive home.选择一项：A. so drunkB. too

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Linda is 35 years old and, after two close relationships, the prospect of stayin

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