Some scientists think there are _______ 2,000 million flashes of lightning per year. 
#26291
A
in short
B
on average
C
as usual
D
in total
推荐题目
Don’t  blame  him any more. _______, he is only a child.
#26090
A
After all
B
In all
C
Of all
D
Above all
It is _________ pleasant to take a crowded bus.
#26872
A
by no means
B
by means of
C
by all means
D
by any means
 The tiger, once a __    __ animal to humans, is now ____ of disappearing on the earth.
#25994
A
dangerous, danger
B
dangerous, in danger
C
in danger, in danger
D
danger, in danger