单项选择题

______ there is little we can do to change the reality, we can not be totally at the mercy of the harsh environment.

A．Since
B．When
C．Unless
D．While
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单项选择题
At a typical Western banquet, soup generally ______ other course.
A．precedes
B．proceeds
C．prevails
D．preludes
单项选择题
In order to ______ the improved features of the new model dishwasher, the salesman encouraged the customer to operate it by himself.
A．demonstrate
B．exhibit
C．reveal
D．uncover
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