单项选择题
The approach to the roads and harbor from the（）entails no difficulty.
A.eastern B.easterly C.eastward D.eastwards
单项选择题 Sometimes a tropical storm moves so slowly that a vessel，if astern of it，can（）it.
单项选择题 Some of these shoals have been disproved and are not charted. Nevertheless mariners should （）with particular caution in this area.
单项选择题 Safe speed is defined as that speed where（）.
