单项选择题
The depth（）a shallow patch，lying about 1.3 miles southeastward of Nanshan Tou lighthouse reduces to about 6.1 meters.
A.above B.over C.up D.upon
单项选择题 The datum from which the predicted heights of tides are reckoned in the tide tables is（）.
单项选择题 The dangerous semicircle of a typhoon in the Southern Hemisphere is that area（）.
单项选择题 The dangerous semicircle of a hurricane in the Northern Hemisphere is that area of the storm （）.
