单项选择题

One of the responsibilities of the Coast Guard is to make sure that all ships obediently follow traffic rules in busy harbors.

A．skillfully
B．safely
C．dutifully
D．currently
<上一题 目录 下一题>
热门 试题

单项选择题
The English first attempted to settle in Maine at the mouth of the Kennebec River in 1607.
A．edge of
B．elbow in
C．entrance to
D．source of
单项选择题
Mounting evidence indicates that acid rain is damaging historic sites in Boston and Philadelphia.
A．Hanging
B．Tentative
C．Increasing
D．Irrefutable
相关试题