Astheworld’slargestterrestrialcarnivore(陆地食肉动物),thepola...
问题详情:
As the world’s largest terrestrial carnivore(陆地食肉动物), the polar bear is the king of the great white north. Adult males can measure more than 9 feet in length and weigh between 770 and 1430 pounds. The polar bear has a strong body while their heads are narrow with small, rounded ears.
Polar bears can be found in northern Canada, Greenland, Norway and Russia, and there have been reports that polar bear tracks have been found as far north as the North Pole. The 5 000 000-square-mile range of the polar bear circles the Arctic and contains pieces of open water where seals are easily caught.
Polar bears live on the annual Arctic sea ice that provides a platform from which they can hunt. They hunt seals on the sea ice by breaking into seal dens in the sea ice. The dens aren’t visible from above, but seeing is less important than smelling to a polar bear----with their sharp sense of smell, polar bears can sense the breathing holes of seals in their dens beneath the snow and ice. As the southern edge of the Arctic ice cap melts in summer, polar bears are forced to stay on land and spend their summers fasting(禁食), living off body fat stored from hunting in spring and winter.
With about 22 000 polar bears living in the wild, the species is not endangered at the moment, but its future is far from certain. Climate change is causing the disappearance of sea ice from which polar bears hunt seals. Sea ice in the Arctic is melting earlier and forming later each year. People have reached an agreement that controls the hunting of polar bears and directs each nation to protect their habitats, but it does not protect the bears against the biggest man-made threat to their survival: global warming. If current warming trends continue, scientists believe that polar bears may disappear within 100 years.
4. Polar bears search fro seals mainly through their ________.
A. eyes B. ears C. noses D. necks
5. The underlined word “dens” in paragraph 3 most probably means” _______”.
A. the skin of the wild animals B. the home of wild animals
C. the breathing hole of seals D. water of the deep sea
6. Which of the following statements is true?
A. A polar bear measures at least 9 feet long.
B. Polar bears can be found in both the North Pole and the South pole.
C. Polar bears stop hunting in summer because seals are hidden at that time.
D. Polar bears may die out as a result of climate change.
【回答】
CBD
知识点:科普环保类阅读
题型:阅读理解
-
(2011·河南省洛阳市统考)依次填入下列各句横线的词语,最恰当的一项是( )①近日,济宁联通公司在全市范...
问题详情: (2011·河南省洛阳市统考)依次填入下列各句横线的词语,最恰当的一项是()①近日,济宁联通公司在全市范围内开展的“吉祥号码”预存话费销售活动在消费者中引起一片________:预存话费是不是变相收取选号费?预存话费是否剥夺了普通消费者的择号权?②在洛杉矶...
-
一个质量为4kg的物体静止在足够大的光滑水平地面上.从t=0开始,物体受到一个大小和方向周期*变化的水平力F作...
问题详情:一个质量为4kg的物体静止在足够大的光滑水平地面上.从t=0开始,物体受到一个大小和方向周期*变化的水平力F作用,力F的变化规律如图所示.则( )A.t=2s时物体沿负方向运动的位移最大B.t=4s时物体运动的位移达最小值C.每个周期内物体的速度变化为一定值D.从t=0开...
-
一部欧美资产阶级*的纪录片,介绍了各国通过立法手段来巩固*成果,下列解说词中说法错误的是A.英国颁布了《权...
问题详情:一部欧美资产阶级*的纪录片,介绍了各国通过立法手段来巩固*成果,下列解说词中说法错误的是A.英国颁布了《权利法案》 B.美国*战争期间颁布《*宣言》C.法国大*期间颁布《*宣言》 D.美国南北战争期间颁布《1787年宪法》【回答】D知...
-
下列说法正确的是 A.物质发生化学反应都伴随着能量变化B.伴有能量变化的物质变化都是化学变化C.在一个确...
问题详情: 下列说法正确的是 A.物质发生化学反应都伴随着能量变化B.伴有能量变化的物质变化都是化学变化C.在一个确定的化学反应关系中,反应物的总能量总是高于生成物的总能量D.放热反应的发生无需任何条件【回答】A知识点:化学反应中的能量变化题型:选择题...
相关文章
- —Lookatthebigcrowdoverthere!Let’sstop
- Oursatellitesarehelpingtoforecast(预报)theweather.Theyare...
- ThenewsofHarperLee’ssecondnovelbroketheinternet.GoSetaW...
- 阅读理解。Tommy’sClothesStoreClothesColorPricesweatergreen, ...
- Ifoverweightpeopleeatlessandtakemoreexercise,they’llso...
- Asweallknow,peopleredecoratetheirhotelsregularly.Howeve...
- ---Thestudentslookverytiredafterthesportsmeeting.---We...
- TakeActionforaBetterWorld:VolunteersNeededSixmonths’pre...
- WelookedthroughtheStylesarchive(档案文件)of2015,sortingthro...
- We’veallexperiencedpeerpressure(同伴压力).Ithappenstoeveryb...