单项选择题

Finding information in today's world is easy. The ______ is how you can tell if the information you get is useful or not.

A．ability
B．competition
C．challenge
D．knowledge
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单项选择题
As a policeman, Mr. Brown thought that he had a duty to ______ the lost children in finding their homes.
A．assist
B．help
C．provide
D．support
单项选择题
We should have a(n) ______ medical examination at least once a year.
A．accurate
B．actual
C．chief
D．thorough
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