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
The girl got nothing in ______ for her kindness, which made her very sad.
#5140
A
prize
B
award
C
medal
D
reward
The Dragon Boat Festival _____ the beginning of the hottest season of the year.
#6517
A
marks
B
makes
C
falls
D
comes
There is a peaceful and calm _____ in the country, quite different from that of a big city.
#5375
A
climate
B
atmosphere
C
system
D
situation