A serious study of physics is impossible     some knowledge of mathematics.
#25748
A
against
B
before
C
beyond
D
without
推荐题目
The situation was very dangerous; the enemies were attacking us _____.  
#27415
A
in and around  
B
from side to side  
C
on all sides   
D
on the other hand
They are_______the same size.You can take_______half of the bread.
#28080
A
of;either
B
with;either
C
in;both
D
at;none