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单选题
What form of ice is of land origin（）.
A
Shuga
B
Floe
C
Spicule
D
Bergy bit
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scholars may be required to credit birds with a far earlier origin than previously thoughtC
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单选题Which statement concerning the navigation of a vessel in ice is FALSE?（）A
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Towing a vessel through an ice field is not recommended except in an emergencyC
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When anchoring in ice，it is advisable to increase the scope of the chain over what is normally used for non-icing conditions
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单选题What describes a flood current（）.A
Horizontal movement of the water toward the land after high tideB
Horizontal movement of the water toward the land after low tideC
Horizontal movement of the water away from the land following high tideD
Horizontal movement of the water away from the land following low tide
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单选题A
To examine the chemical elements in the Ice Age.B
To look into the pattern of solar wind activity.C
To analyze the composition of different trees.D
To find out the origin of carbon-14 on Earth.
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单选题What generally occurs when the land is cooler than the nearby water? （）A
A land breezeB
A sea breezeC
A northerD
A prevailing westerly
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单选题What are the mandatory，well-known BGP attributes？（）A
origin，AS-path，next-hopB
AS-path，origin，MEDC
AS-path，origin，weightD
AS-path，weight，MED
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单选题According to the passage, which of the following is true of the ratios of oxygen isotopes in ocean sediments?A
They indicate that sediments found during an ice age contain more calcium carbonate than sediments formed at other times.B
They are less reliable than the evidence from rocks on land in determining the volume of land ice.C
They can be used to deduce the relative volume of land ice that was present when the sediment was laid down.D
They are more unpredictable during an ice age than in other climatic conditions.E
They can be used to determine atmospheric conditions at various times in the past.
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单选题A similar wrong idea is that fish and ice cream when ____ at the same time form a poisonous combination.A
eatingB
being eatenC
eatenD
to be eaten
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单选题What is the purpose of the passage?A
To tell people not to do dangerous sports.B
To explain what volcano surfing and land diving are.C
To talk about the world’s best volcano surfer and land diver.D
To compare activities in Vanuatu with sports in New Zealand.
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单选题Where do polar bears usually hunt seals?A
On land.B
In open water.C
In openings in the sea ice.D
At the bottom of the sea.
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单选题What will happen with the freshening of waters?A
Sea-ice formation will reduce,B
Antarctic ice shelves will melt.C
Rainfall will increase,D
The circulation of deep waters will reduce.
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单选题The North Pole is surrounded by land, while the South Pole is surrounded by the Antarctic Ocean.So scientists thought that______.A
most of the ice melted in the Northern hemisphereB
most of the ice melted in the Southern hemisphereC
The North Pole is colder than the South PoleD
The South Pole is colder than the North Pole
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单选题A light，feathery deposit of ice caused by the sublimation of water vapor directly into the crystalline form，on objects whose temperatures are below freezing，is called（）.A
dewB
frostC
glazeD
snow
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