单项选择题

The physicist has made a discovery, _______ of great importance to the progress of science and technology.

A．which I think it is
B．which I think is
C．that I think is
D．I think which
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单项选择题
She is always fashionably dressed and looks _______ among the girls in plain clothes.
A．outstanding
B．conspicuous
C．unusual
D．distinguishing
单项选择题
if you keep getting wrong numbers, your phone could be _______.
A．deceptive
B．ineffective
C．deficient
D．defective
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