Scientists are convinced _____the positive effect of laughter _____physical and mental health．
#70992
A
of ;on
B
by; in
C
of ; at
D
on ;at
推荐题目
Although his experiments were designed to support the ideas the influence of environment upon plants, Mendel found that many characteristics were passed on from one generation to the next.
#76486
A
concerning
B
attaching to
C
involving in
D
concerning with
In ,the northerners are keen on dumplings while the southerners are fond of rice.
#80845
A
common
B
total
C
general
D
particular
The government has promised to the matter and give the workers a satisfactory answer.
#71158
A
look into
B
look through
C
look out
D
put into
You can hardly imagine the difficulty the woman had _____ her children.
#81699
A
brought up
B
bring up
C
bringing up
D
to have brought up
－－Shall we meet right now?－－Sorry. I’m too busy to _______ for the moment.
#81612
A
get through
B
get away
C
get off
D
get together