Global warming caused by human being’s casual behaviour has become a major _______ for people all over the world.
#5589
A
conflict
B
concern
C
challenge
D
factor
推荐题目
We’ll be free tomorrow, so I suggest ____ to the history museum.
#6943
A
to visit
B
visiting
C
we should visit
D
a visit
The Postal Service announced Tuesday it had made a significant _______in getting machinces to read handwriting .
#6703
A
progress
B
break through
C
impression
D
difference
I am writing to express my _______ for the safety of children travelling on school buses, especially those on high-risk and highway-speed routes.
#5671
A
attention
B
emotion
C
affair
D
concern
Can you imagine that rats eat 40 to 50 times _______.
#6529
A
by weight
B
their weight
C
in weight
D
of their weight