单项选择题
There is a VHF set（）the front of the wheelhouse.
A.at B.on C.of D.in
单项选择题 There is a drifting mine（）in position 21 degrees 31 minutes North 124 degrees 20 minutes East.
单项选择题 There is a（）mine in position 50°N，30°W.
单项选择题 The weather is often（）in a high-pressure area.
