Polar Bears on Thin Ice Quiz

　Choose the correct answer.

９.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 ①　　　　. It's a highly sensitive region, and it's being profoundly affected by the　changing ②　　　　　. Most scientists view what's happening now in the③　　　　　　 as a harbinger of things to come. global warming：地球温暖化　scientists：科学者　as a harbinger：先駆け
①	ice
	oil
	coal mine
②	ice
	water level
	climate
③	South
	Earth
	Arctic
2. Polar bears are strong ④　　　　; 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 ⑤　　　 km. without hesitation：躊躇なしで　continuously：連続して
④	boxers
	wrestlers
	swimmers
⑤	10
	100
	500
３.Polar bears can live ⑥　　　　 years.
⑥	10 to 15
	20 to 30
	40 to 50
４.The world polar bear population is estimated to be between ⑦individuals . estimated：推定
⑦	21,000～28,000
	101,000～108,000
	501,000～508,000
５.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 ⑧　　　. 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 ⑨　　　. concern：懸念　 oil exploration：石油探索　 Scientific Meeting：学会　　　　representaive：代表　 international conferences：国際会議　　　　　　　　　　　　　　　　　research effort：研究努力　international agreement：国際合意
⑧	1865
	1965
	2005
⑨	conservation
	management
	breeding
６.Scientists predict that ⑩　　　 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：海氷　survival：生き残り
⑩	40
	60
	80

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