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 本文主要介紹了北極熊的生活環(huán)境以及全球氣候變暖對(duì)他們的影響.冬季變短使得他們的捕食變得困難,海里的塑料和化學(xué)品也會(huì)影響他們的生存,污染,使它們處于瀕臨滅絕的境地.

解答 66.A 細(xì)節(jié)理解題.根據(jù)第一段的"Churchill is out in the middle of nowhere,"可知,丘吉爾這個(gè)地方不在任何地方的中心,所以暗示它在一個(gè)非常偏遠(yuǎn)的地區(qū),故選A.
67.B 推理判斷題.根據(jù)第一段的"Then they go out onto the frozen sea to hunt ringed seals--their favorite food然后他們走到凍結(jié)冰的海上去獵取環(huán)斑海豹,這是它們最喜歡的食物"和第二段的"polar bears have less time to hunt for seals北極熊獵取海豹的時(shí)間更少了."可知文章解釋了北極熊飲食中最重要的元素.選項(xiàng)A北極熊威脅人類的方式,選項(xiàng)C北極熊交配的形式,選項(xiàng)D北極熊出生的時(shí)節(jié),在文章中都沒(méi)有涉及,故選B.
68.D 細(xì)節(jié)理解題.問(wèn)北極熊捕獵季節(jié)的變化,根據(jù)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,冰形成的時(shí)間越來(lái)越晚,春天來(lái)的越來(lái)越早,所以北極熊的捕獵時(shí)間縮短了,故選D.
69.C 推理判斷題.選項(xiàng)A它們?nèi)绾伪苊饨煌ㄊ鹿,選項(xiàng)B它們?cè)鯓訌谋舜松砩蠈W(xué)習(xí)好習(xí)慣,選項(xiàng)D在惡劣天氣的時(shí)候它們?cè)趺凑也厣碇,在文中都沒(méi)有涉及.根據(jù)第三段可知,它們深受污染之苦,因?yàn)槲廴,它們處于瀕臨滅絕的境地,故選C.

點(diǎn)評(píng) 本文是人文地理類閱讀,考查學(xué)生對(duì)細(xì)節(jié)的理解把握和推理判斷能力,做題時(shí)一定要找到文章中的原句,和題干進(jìn)行比較,再做出正確選擇.在做推理判斷題時(shí)不要以個(gè)人的主觀想象代替文章的事實(shí),要根據(jù)文章事實(shí)進(jìn)行合乎邏輯的推理判斷.

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