单项选择题

We are not conscious of the extent of which work provides the psychological satisfaction that can make the difference between a full and empty life.()

A. to which
B. in which
C. at which
D. by which

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单项选择题

Water makes up some 70 percentage points of the body, and drinking enough water-either tap water or expensive mineral water-will ensure that the body is properly lubricated and flushed.()

A. per-cent
B. per capita
C. percent
D. percentage

单项选择题

While it is essential that the text covers the subject adequately, it is also important that it is neither too detailed or too complex for the intended reader.()

A. for
B. nor
C. no
D. not

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