单项选择题

(Thirteen hundred) medical professionals, (all of which) have been trained to treat drug dependency, (attended) the annual convention (sponsored) by a society.

A．Thirteen hundred
B．all of which
C．attended
D．sponsored
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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
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
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