单项选择题

To control (quality) and (making) decisions (about) production are among the many responsibilities of an (industrial) engineer.

A．quality
B．making
C．about
D．industrial
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单项选择题
Some of these studies (have shown) that although some people have trouble (to fall asleep), others have an (equally) difficult time (waking up).
A．have shown
B．to fall asleep
C．equally
D．waking up
单项选择题
Although the police (are) given considerable authority by society to enforce (it's) laws, they get a relatively low salary as compared with (that) of other occupational groups which have much (fewer) authority.
A．are
B．it's
C．that
D．fewer
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