单项选择题

During daylight savings time the meridian used for determining the time is located farther （）.

A.west in west longitude and east in east longitude
B.east in west longitude and west in east longitude
C.west
D.east

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单项选择题

During a period of whiteout，you should expect which of the following（）.

A.Snowfall or blowing snow
B.Lack of ability to estimate distance
C.Harsh contrast between sun-illuminated snow cover and the background
D.Hazy horizons with extensive mirage effects

单项选择题

Due to lapse of time the risk in these areas to surface navigation is now considered （）than the ordinary risks of navigation，but a very real risk still exists with regard to anchoring，fishing or any form of submarine or seabed activity.

A.more serious
B.not less serious
C.more dangerous
D.no more dangerous