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
—May I have a word with you?—________.I’m not busy, anyway.
#26616
A
By no means
B
By all means
C
By means of
D
By any means
They were making a plan to help those students _____, which attracted me.
#25979
A
in brief
B
in public
C
in action
D
in need
I am concerned ____ it that I can’t concentrate ____ my work because of headache.
#25624
A
of; on
B
of; of
C
about; on
D
about; to
________ his arrival, he began to make preparations for the speech of the conference.
#27444
A
In
B
With
C
On
D
By