The population problem may be ______ one of the world today.
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A
the most
B
most difficult
C
the greatest
D
more interesting
推荐题目
 I think Maths is ________ of all my subjects.
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A
much difficult one
B
difficult one
C
most difficult one
D
the most difficult one
The Yellow River is the second _________ river in our country.
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A
the longest
B
longest
C
longer
D
long
The _____you work , the _____grades you will get.
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A
hard, good
B
harder, better
C
hardest, best
D
harder, good