单项选择题
The dense black cumulonimbus clouds surrounding the eye of a hurricane are called（）.
A.Spiral rainbands B.Cloud walls C.Funnel clouds D.Cyclonic spirals
单项选择题 The Beaufort scale is used to estimate the（）.
单项选择题 The area of strong westerly winds occurring between 40°S and 60°S latitude is called the（）.
单项选择题 The AMVER system requires（）.
