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第1题

She has been _______ a letter from him, but nothing arrived. A. wanting B. expecting C. desiring D. longing
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第2题

_______ is related to illness is not a new discovery． A. The food B. That food C. What food D. Which food
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第3题

如果二元随机变量(X,Y)有D(X﹣Y)=D(X+Y),则X与Y不相关。(本题2.0分) A、 正确 B、 错误
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第4题

)He focused on his work _____hard that he forgot the time. A. such B. very C. so D. much
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