单项选择题

Day-shapes must be displayed（）.

A.between sunset and sunrise
B.only between 8 AM and 4 PM
C.during daylight hours in any visibility
D.during daylight hours in unrestricted visibility only

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单项选择题

Daylight savings time is a form of zone time that adopts the time（）.

A.one zone to the east
B.one zone to the west
C.two zones to the east
D.two zones to the west

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Dacron sails，when not in use，may be damaged if（）.

A.left in the sunlight
B.stowed wet
C.washed with soap
D.folded frequently

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Cyclones that have warm sectors usually move（）.

A.westerly
B.parallel to the isobars in the warm sector
C.toward the nearest high pressure area
D.faster than the accompanying cold front