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第1题

[计算题,8.3分] 计算级坐标计算二重积分∫∫ln（1+x2+y2）dxdy其中D：x2+y2≤1，x≥0，y≥0
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第2题

— Are you on holiday here? — _________________. 选择一项： A. We are on holiday here, too B. We live here, too C.
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第3题

选择题 　　Maggie Walker was born in 1867 in Richmond, Virginia. Her mother was once a slave in a rich woman.s house. When
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第4题

The young ______ interested in pop music. 选择一项： A. are B. is C. have
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