单项选择题
A.watch B.look for C.see D.regard
During daylight savings time the meridian used for dete...
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
During a period of whiteout，you should expect which of ...
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
Due to lapse of time the risk in these areas to surface...
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
