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【简答题】
一组数据a 1 ，a 2 ，a 3 ，…，a n 的方差为1，则数据2a 1 -1，2a 2 -1，2a 3 -1，…，2a n -1的方差为______．
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【简答题】The person behind you constantly kicks the back of your seat．Your talkative seatmate doesn’t understand your need for sleep．And the aircraft’s bathroom is a total mess．These situations can make even a...
【单选题】Little _______ what you said. I wish you repeated it.
A.
I understand
B.
did I understand
C.
I did understand
D.
have I understood
【单选题】Would you mind _____ it again? Try to make yourself ______. [ ]
A.
say, understood
B.
to say, understand
C.
saying, understand
D.
saying, understood
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