单项选择题 In the Northern Hemisphere，the right half of the storm is known as the dangerous semicircle because（）.

单项选择题 In the Northern Hemisphere，if your vessel is in a hurricane’s navigable semicircle it should be positioned with the wind on the（）.

单项选择题 In the Northern Hemisphere，an observer at point II in the weather system should experience a wind shift from the（）.