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【单选题】
1+a+(b-2)i =0,则a,b的值为A.
a=0，b=0
B.
a=1，b=2
C.
a=-1，b=2
D.
a=-1，b=-2
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A.
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B.
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C.
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D.
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A.
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A.
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【单选题】听力原文：M: You must be pretty excited about your trip to Europe, Mary. When is it that you are leaving? W: In just three weeks, and I am really excited. But there are still a few things I need to do befo...
A.
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B.
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C.
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D.
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