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
The reason why people might not be able to stay alive in a world without emotion is that ______
A．they would not be happy with a life without love
B．they would not be able to tell the texture of objects
C．they would do things that hurt each other’s feelings
D．they would not know what was beneficial and what was harmful to them
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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