从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性()
A.选项A
B.选项B
C.选项C
D.选项D
参考答案:C
The magician picked some persons from the audience _____ and asked them to help him with the performance.
A.by accident
B.in vain
C.at random
D.on average
以下哪个海域不是完全受沿海国主权的支配和管辖
A.内海
B.领海
C.群岛国的群岛水域
D.大陆架