语法词汇练习 语法大全 语法详解 英语听力 
The scientists are studying the effects of human activities______the environment.
#29004
A
in
B
at
C
on
D
with
下一题
推荐题目
I’ll be free ___ seven o’clock.
#28796
A
after
B
on
C
in
D
at
The old man is blind ___ the left eye.
#28875
A
in
B
on
C
at
D
by
Which book is much better      quality?
#26585
A
In need of
B
in case of
C
in terms of
D
in favor of
It is amazing that the little boy can swim ________the river ________100 meters in width.
#25840
A
across; measuring
B
over; measured
C
across; measure
D
through; measuring
Tell me ________ how it came about that you were 20 minutes late for class. You needn’t go into details.
#25593
A
in advance
B
in vain
C
in total
D
in brief