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【单选题】
设二维离散型随机变量 (X,Y) 的分布律为 ,则( )A.
X,Y不独立
B.
X,Y独立
C.
X,Y不相关
D.
X,Y独立且相关
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反馈参考答案：
举一反三
【单选题】—Where are his parents from? —They ________ from Nanjing. [ ]
A.
are both
B.
both are
C.
are all
D.
all are
【简答题】0胎儿血红蛋白是指
【单选题】He loves his parents deeply, ________ are very kind to him.
A.
both of them
B.
both of who
C.
whom
D.
both of whom
【单选题】The __________ of his books among parents and the recommendation of experts both at home and abroad have quickly made him a celebrity educator.
A.
similarity
B.
popularity
C.
personality
D.
possibility
【单选题】Both his parents died in a traffic accident when he was a baby, so he was ______by his grandma. [ ]
A.
brought about
B.
brought up
C.
brought in
D.
brought down
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