航海英语海上天气现象单项选择题每日一练(2017.11.18)

单项选择题
You have determined that you are in the right semicircle of a tropical cyclone in the Northern Hemisphere.What action should you take to avoid the storm（）.
A.Place the wind on the starboard quarter and hold that course
B.Place the wind on the port quarter and hold that course
C.Place the wind on the port bow and hold that course
D.Place the wind on the starboard bow and hold that course
单项选择题
In regions near the poles，the winds are generally described as（）.
A.Westerlies
B.Easterlies
C.Northerlies
D.Southerlies
单项选择题
High clouds，composed of small white flakes or scaly globular masses，and often banded together to form a mackerel sky，would be classified as（）.
A.cirrus
B.cirrocumulus
C.altostratus
D.cumulonimbus
单项选择题
Cirrus clouds are composed primarily of（）.
A.ice crystals
B.water droplets
C.snow crystals
D.nitrogen
单项选择题
Your facsimile prognostic chart indicates that you will cross the cold front of a low pressure system in about 24 hours.You should（）.
A.Expect to see cirrus clouds followed by altostratus and nimbostratus clouds
B.Alter course to remain in the navigable semicircle
C.Prepare for gusty winds，thunderstorms，and a sudden wind shift
D.Expect clear weather，with steady winds and pressure，until the front passes