单选题Multi-year ice is the hardest sea ice and should be avoided if possible. It is recognizable because of what tone to its surface color? （）AGreenishBBluishCGreyDGrey-white
单选题
Multi-year ice is the hardest sea ice and should be avoided if possible. It is recognizable because of what tone to its surface color? （）
A
Greenish
B
Bluish
C
Grey
D
Grey-white
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单选题Before entering an ice area，the ship should be（）.Aeither trimmed by the head or the sternBon an even keelCtrimmed down by the headDtrimmed down by the stern
单选题The information on（）is not likely found in The Mariners Handbook.AIALA Buoyage systemBhydrography，topography，navigational aids and their servicesCbasic meteorology and navigation in ice and hazards and restrictions to navigationDinformation on tides，currents and characteristics of the sea
单选题When operating in an area where sea ice and icebergs are present，which statement is TRUE? （）AIcebergs may travel in a direction many degrees different from the sea iceBBoth icebergs and sea ice will move in approximately the same direction and at the same speedCIcebergs and sea ice will move in the same direction，but at different speeds due to the sail effect of the bergDIcebergs and sea ice will move in the same direction，but the iceberg will move slower because of its underwater bulk
单选题The scientists are not sure_______.Ahow long the ice age lastedBwhere ice sheets melted during the ice ageCwhat caused the temperature changesDwhat the earth is made up of
单选题Small floes of rough，hummocky sea ice capable of damaging a vessel（）.Acan usually be detected by radar in a smooth sea at a range of 4 to 6 kilometersBare indistinguishable from sea return on the PPICare invisible to radar when covered with a thick layer of snowDare usually seen at night before they are close enough to provide a radar echo
单选题You are on an ice-reinforced vessel about to enter packice. You should（）.Aenter the pack on the windward side where there is a well defined ice edgeBtrim to an even keel or slightly down by the bow to take maximum benefit of the ice reinforcementCtake maximum advantage of coastal leads caused by offshore windsDlook for areas of rotten ice and enter perpendicular to the ice edge
单选题Over the past decades, sea ice _____ in the Arctic(北极) as a result of global warming.Ahad decreasedBwill decreaseChas been decreasingDis decreasing
单选题According to the passage, which of the following statements is TRUE?AStarving polar bears are increasingly coming into villages, where they may be killed either for food or safety.BPolar bears can spend their entire lives on land if the sea ice melts completely.CTwo-thirds of the world's polar bears may disappear by 2050 as global warming continues.DThe growing distance between ice packs is not a problem for polar bears, because they are excellent swimmers.
单选题Where do polar bears usually hunt seals?AOn land.BIn open water.CIn openings in the sea ice.DAt the bottom of the sea.
单选题Which of the following is the best title for the passage ?AA computer modelBStudies show ice melted equally in the North and the South during the ice ageCMost of the ice melted in the Northern hemisphere during the 30,000-year long ice ageDA survey result