@Choose the correct answer.

‚X.Polar Bears on Thin Ice Quiz

1. Why are global warming specialists watching the Arctic so closely? @@@The Arctic is global warming's canary in the ‡@@@@@.
It's a highly sensitive region, and it's being profoundly affected by the@changing
‡A@@@@@. Most scientists view what's happening now in the‡B@@@@@@ as a harbinger of things to come.

global warmingF’n‹…‰·’g‰»@scientistsF‰ÈŠwŽÒ@as a harbingerFæ‹ì‚¯

‡@ ice
oil
coal mine
‡A ice
water level
climate
‡B South
Earth
Arctic
2. Polar bears are strong ‡C@@@@; they swim across bays or wide leads without hesitation. They can swim for several hours at a time over long distances. They've been tracked swimming continuously for ‡D@@@ km.

without hesitationFçSçO‚È‚µ‚Ł@continuouslyF˜A‘±‚µ‚Ä

‡C boxers
wrestlers
swimmers
‡D 10
100
500

‚R.Polar bears can live ‡E@@@@ years.

‡E 10 to 15
20 to 30
40 to 50
‚S.The world polar bear population is estimated to be between ‡Findividuals .

estimatedF„’è

‡F 21,000`28,000
101,000`108,000
501,000`508,000
‚T.Growing public concern about polar bear hunting and other human activities in the Arctic, such as oil exploration, led to the First International Scientific Meeting on the Polar Bear in ‡G@@@. Attending were representatives from all five polar bear countries: Canada, Greenland (territory of Denmark), Norway, the United States, and the former Union of Soviet Socialist Republics. The meeting set the stage for additional international conferences and research efforts, which eventually led to an international agreement on polar bear ‡H@@@.

concernFŒœ”O@ oil explorationFÎ–û’Tõ@ Scientific MeetingFŠw‰ï@@@@representaiveF‘ã•\@ international conferencesF‘Û‰ï‹c@@@@@@@@@@@@@@@@@research effortFŒ¤‹†“w—Í @international agreementF‘Û‡ˆÓ

‡G 1865
1965
2005
‡H conservation
  management
breeding
‚U.Scientists predict that ‡I@@@ percent of the summer sea ice that polar bears depend on for survival could be gone in 20 years, and all of it by 2040.

summer seaFŠC•X@survivalF¶‚«Žc‚è

‡I 40
60
80
@

NRDC

Polar Bear S.O.S

Polar Bears

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