This also keeps the air，soil，water crops________ chemicals.
#25521
A
out of
B
out from
C
free of
D
rid of
推荐题目
—Quite a lot of students failed in the math exam． —Exactly．It is ____ their abilities．
#27371
A
within
B
over
C
against
D
beyond
A large number of people are _____, and how can the local government ignore the problem?
#26124
A
at work
B
in work
C
out of work
D
after work
Theory is based on practice and ________ serves practice.
#27483
A
in turn
B
by and by
C
by chance
D
in this case
The majority of the local people got benefit from the medical reform which they are in ___ of.
#27690
A
honor
B
danger
C
favor
D
memory