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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单项选择题
In an attempt to get to the _______ of the problem, the reporter interviewed every eyewitness.
A．root
B．gist
C．base
D．center
单项选择题
Label on bottle of medicine: It is dangerous to exceed the stated _______.
A．drops
B．measure
C．dose
D．limit
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