Looking for information on line today is very easy ; the _____________is how to

题干

Looking for information on line today is very easy ; the _____________is how to tell whether the information you are getting is useful or not.

A．challenge	B．ability
C．knowledge	D．competition

上一题下一题 0.85难度单项选择更新时间:2014-12-14 08:07:59

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