单项选择题
A.rising air currents produced by the warm islands
B.warm air from the sea rising over higher land areas
C.cool land air mixing with warm sea air
D.descending air over the islands
单项选择题 In good weather，you should deploy the sea anchor from the liferaft to（）.
单项选择题 If you are sailing from the East Coast of the United States to the Caribbean Sea，which publication would contain information on weather，currents，and storms?（）
单项选择题 If the current and wind are in the same direction，the sea surface represents a wind speed （）.