During the voyage he encountered boisterous winds and heavy weather during which time the vessel（）heavily and to such an extent that at times it was necessary to change course.

单项选择题CAPE WEST WIND WEST TO SOUTHWEST 15 TO 20 KNOTS WEATHER SHOWERS.This description is likely to be under the heading of（）.

A.FORECAST
B.STORM WARNING
C.GENERAL SITUATION
D.MAP ANALYSIS

单项选择题BASHI:E TO SE 9-10．500M IN HVY SQUALLY SHWRS AND TS．SEA 8-9M.SWELL SE 6-7M．From the above forecast，the wind in Beaufort Scale will be（）.

A.STRONG GALE TO STORM
B.GALE TO STRONG GALE
C.NEAR GALE TO GALE
D.STRONG BREEZE TO NEAR GALE

单项选择题As the temperature for a given mass of air increases，the（）.

A.dew point increases
B.dew point decreases
C.relative humidity increases
D.relative humidity decreases

单项选择题Anticyclones are usually characterized by（）.

A.dry，fair weather
B.high winds and cloudiness
C.gustiness and continuous precipitation
D.overcast skies

单项选择题An occluded front on a weather map is colored（）.

A.blue line
B.purple line
C.dashed blue line
D.alternate red and blue line