南、北美洲的分界线是[ ]
A、苏伊士运河
B、巴拿马运河
C、土耳其海峡
D、地中海
答案：B
China has demanded the US to reduce and ____ stop its military air and sea spying to avoid naval confrontation (海上对抗). [ ]
A. extremely
B. slightly
C. gradually
D. eventually
