题目内容

Put in the blanks appropriate prepositions or adverbs.The newspaper reporter sent to look ________ the case was amazed ________ the inside story that the expenses had added ________ ________ almost 2 billion dollars.

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Put in the blanks appropriate prepositions or adverbs.These parks for certain will add greatly ________ the beauty of the city.

Put in the blanks appropriate prepositions or adverbs.________ all her aches and pains, she walked for hours at a stretch and finally managed to join her comrades.

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当模型存在异方差现象,加权最小二乘估计量具备()。

A. 线性
B. 无偏性
C. 有效性
D. 一致性
E. 精确性

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