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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单项选择题
He stopped the car so ______ that he was hit by the car behind him.
[A] barely
[B] abruptly
[C] hardly
[D] strictly
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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