單項選擇題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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1.單項選擇題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

2.單項選擇題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

3.單項選擇題Cumulus clouds that have undergone vertical development and have become cumulonimbus in form,indicate().

A.clearing weather
B.that a warm front has passed
C.probable thunderstorm activity
D.an approaching hurricane or typhoon

4.單項選擇題Cumulonimbus clouds are formed by().

A.vertical air movements
B.heavy rainstorms
C.horizontal air movements
D.any movement of moist air

5.單項選擇題Corrosive liquids and acids should have which kind of label?()

A.Skull and crossbones
B.Yellow and white
C.Red and white
D.White and black