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【单选题】
As it turned out to be a small house party, we __ so formally.A.
need not have dressed up
B.
must not have dressed up
C.
did not need to dress up
D.
must not dress up
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【简答题】在置于磁场中的导体或半导体内通入电流,若电流与磁场 ,则在与磁场和电流都垂直的方向上会出现一个 ,这种现象称为 。
【简答题】在置于磁场的导体或半导体中通入电流,若电流与磁场垂直,则在与磁场和电流都垂直的方向上会出现一个电势差,这种现象就是 。
【单选题】During the___days guest can look out and see the entine earth with their own eyes.
A.
third
B.
three
C.
threes
D.
thirds
【单选题】—Do you have Mary’s phone number? —Sorry, _____.
A.
I don’t know
B.
forget it
C.
here you are
D.
I can’t remember
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【单选题】— You have helped me a lot. I can’t thank you enough. —______.
A.
Be my guest.
B.
That’s right.
C.
I don’t think so.
D.
Think nothing of it.
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