Scientists are convinced _____the positive effect of laughter _____physical and mental health．
#26778
A
of ;at
B
by; in
C
of ; on
D
on ;at
推荐题目
Price control would gradually disappear ________ a free market.
#26138
A
in need of
B
in favor of
C
in charge of
D
in honor of
We have already placed an order ____ that company _____ the machines.
#27602
A
for; with
B
for ; for
C
with; for
D
to; with
If you stick it out, your success is ___________.
#27697
A
in question
B
beyond question
C
out of the question
D
out of question
Everyone can borrow from this public library only two books _____ and they must be returned within a month.
#27493
A
at one time
B
at times
C
at the time
D
at a time
The dress is very nice, but not ______ the girl's taste, for she is somehow particular.
#25614
A
for
B
with
C
by
D
to