_________ is a growing world problem, and nowadays the United Nations and its member countries _________hard to deal with it．
#6050
A
Desertification; are working
B
Desertified ; worked
C
Desert; work
D
Desertification; have worked
推荐题目
The children are full of ______. They have been playing all day long without resting.
#6224
A
force
B
power
C
energy
D
strength
We won't know whether it will be successful. We won't know whether there will be good _____.
#6929
A
ends
B
results
C
effects
D
causes
Classical novels often have ________ which add interest, tension, or deeper meaning to the text; mist is one in Great Expectations.
#5241
A
lotus
B
privilege
C
syllables
D
symbols
Professor Smith and his wife are of the same______; they both expect their daughter to study abroad.
#7248
A
destination
B
mood
C
heart
D
mind