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4.Located in northern Manitoba on the west side of Hudson Bay,Churchill is out in the middle of nowhere.But polar bears like it that way.They spend summers on the tundra (苔原) around Churchill.In the fall,they wait anxiously along the shore of Hudson Bay for the ice to form.Then they go out onto the frozen sea to hunt ringed seals--their favorite food.October and November are the best polar-bear viewing times.From tundra vehicles,visitors to Churchill observe the bears.Some enjoy day trips or stay overnight on large tundra vehicles that have private cabins and eating facilities.Others stay at a wilderness lodge on the bears'migration route to view the vigorous creatures.These lodges can be reached only by air and feature luxury food and living arrangements.
Despite the large number of polar bears that visit Churchill each year,there is growing concern about the animals'future.Because the earth is getting warmer,the ice forms later in the year now and disappears sooner in the spring.As a result,polar bears have less time to hunt for seals.Polar bears can also find smaller animals,bird eggs and berries on land,but this kind of food is not sufficient to support the animals.
Polar bears are also affected by plastic and chemicals that get into the ocean.A research project carried out in northern Europe has found high concentrations of both plastic and chemicals in the tissue of polar bears.These materials and substances can damage the animals'internal organs,especially when the animals are not yet mature.Many people are researching polar bear health.Their goal is to gather the information that is needed to help save these animals.

66.What does this article imply about Churchill?A
A.It's located in a very remote area.
B.It's attracting fewer tourists now.
C.It's surrounded by smaller towns.
D.It's dependent on the oil industry.
67.What does this article explain about polar bears?B
A.The ways in which they threaten people
B.The most important elements of their diets
C.The mating behavior that they exhibit
D.The time of year when they give birth
68.How is the polar bears'seal winter hunting season changing?D
A.It's starting earlier.
B.It's becoming colder.
C.It's finishing later.
D.It's getting shorter.
69.What can we learn about polar bears from this article?C
A.How they avoid traffic accidents
B.How they learn good habits from one another
C.How they're endangered by pollution
D.How they find a hiding place during bad weather.

分析 本文主要介绍了北极熊的生活环境以及全球气候变暖对他们的影响.冬季变短使得他们的捕食变得困难,海里的塑料和化学品也会影响他们的生存,污染,使它们处于濒临灭绝的境地.

解答 66.A 细节理解题.根据第一段的"Churchill is out in the middle of nowhere,"可知,丘吉尔这个地方不在任何地方的中心,所以暗示它在一个非常偏远的地区,故选A.
67.B 推理判断题.根据第一段的"Then they go out onto the frozen sea to hunt ringed seals--their favorite food然后他们走到冻结冰的海上去猎取环斑海豹,这是它们最喜欢的食物"和第二段的"polar bears have less time to hunt for seals北极熊猎取海豹的时间更少了."可知文章解释了北极熊饮食中最重要的元素.选项A北极熊威胁人类的方式,选项C北极熊交配的形式,选项D北极熊出生的时节,在文章中都没有涉及,故选B.
68.D 细节理解题.问北极熊捕猎季节的变化,根据第二段的"Because the earth is getting warmer,the ice forms later in the year now and disappears sooner in the spring"可知,冰形成的时间越来越晚,春天来的越来越早,所以北极熊的捕猎时间缩短了,故选D.
69.C 推理判断题.选项A它们如何避免交通事故,选项B它们怎样从彼此身上学习好习惯,选项D在恶劣天气的时候它们怎么找藏身之处,在文中都没有涉及.根据第三段可知,它们深受污染之苦,因为污染,它们处于濒临灭绝的境地,故选C.

点评 本文是人文地理类阅读,考查学生对细节的理解把握和推理判断能力,做题时一定要找到文章中的原句,和题干进行比较,再做出正确选择.在做推理判断题时不要以个人的主观想象代替文章的事实,要根据文章事实进行合乎逻辑的推理判断.

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