选择题：There are too many _____ here for me to concentrat

题目内容：

There are too many _____ here for me to concentrate on my term paper.　
(A) distractions
(B) dimensions
(C) destructions
(D) directions

参考答案：

A highly organized system of irrigation is ____ Ch

A highly organized system of irrigation is ____ Chinese agriculture.　(A)typica

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工资率变动对劳动力需求的影响包括（　　　）(A)规模效应和收入效应(B)规模效应和替代效应(C)收入效应和替代效应(D)收入效应和边际效应

[阅读题,50分]There once lived in China a very foolish king and queen. One day the qu

The two scholars worked at the task of writing a preface to the new dictionary f