(2014·安徽蚌埠第一次教学质量检查)Finding information in today’s world is easy.The  ________is how you can tell if the information you get is useful or not.
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A
knowledge 
B
ability
C
competition 
D
challenge
推荐题目
The newly-built lab is ______ the old one.
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A
three times so big as
B
as three times big as
C
three times bigger than
D
three times the size