A serious study of physics is impossible________some knowledge of mathematics.(2013·大纲全国，31)
#25263
A
against
B
before
C
beyond
D
without
推荐题目
He hurried to the airport and got _______ the plane just in time.
#27117
A
on board
B
in board
C
on the board
D
in the board
It was because it had been raining for several days, leading to a flood over the fields and the villages that many people fell _______ without foods and shelters.
#26172
A
by accident
B
in trouble
C
behind schedule
D
on purpose