Lately some scientists are experimenting ___________ white mice to ____________ this kind of medicine.
#27470
A
on,try on
B
with, test on
C
on ,test out
D
with,carry out
推荐题目
Highspeed trains which travel through my hometown ________ up to 250 km per hour make it a small world.
#25287
A
with
B
against
C
at
D
over
The pianist began to play and the girl in red began to sing ＿＿＿＿the music.
#28775
A
with
B
along
C
through
D
to
We have _______ books in our library.
#27714
A
plenty of
B
great many
C
a great deal of
D
great number of