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
This umbrella is____that one,but____than that one.
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A
as beautiful as,expensive
B
as beautifully as,more expensive
C
as beautiful as,more expensive
D
more beautiful as,as expensive
Tom is one of the ____________ students in our class.
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A
tall
B
taller
C
more taller
D
tallest
— Which do you think is ______ subject, math, music or art?— Art, I guess. 
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A
interesting
B
more interesting
C
most interesting
D
the most interesting
The 18th  National Congress of the CPC has been one of______things in our life recently.
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A
important
B
more important
C
most important
D
the most important
 He doesn’t do his homework _________, though he has ______________.
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A
carefully enough , enough time
B
enough carelessly, time enough
C
carelessly enough, enough time
D
enough carefully,enough time