The mountains form a natural            between the two countries so they have no trade relations in history.
#6961
A
exchange
B
bridge
C
barrier
D
fence
推荐题目
He had no special ______ and was treated just like every other prisoner.
#5349
A
privileges  
B
possessions 
C
identifications
D
treasures
The rice ___ cut three weeks ago.
#7337
A
was
B
were
C
has been
D
have been
 The lawyer required the ____ of evidence so that he could defend the accused.
#6332
A
judgment
B
contribution
C
subscription
D
presentation