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第1题

二元函数z=3(x+y)-x³-y³的极值点是（） A. (1,2) B. (1,-2) C. (1,-1) D. (-1,-1)
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第2题

17.Michael: Hi, mom. I’d like you to meet my girlfriend, Susan Lee. Susan, this is my mother. Susan: How do you do, Mrs
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第3题

16.The members of an extended family are ____ by blood or by marriage.(3分) A. relative B. relates C. relate D. relat
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第4题

15.It is likely _____ she will win the prize.(3分) A. that B. when C. in which D. which
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