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    Because of climate change, the ice that polar bears depend on for survival . A.are slowly disappearing B.is slowly disappearing C.are slowly disappeared D.have slowly disappeared 【查看更多】

     

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    Because of climate change, the ice that polar bears depend on for survival        .

    A.are slowly disappearing

    B.is slowly disappearing

    C.are slowly disappeared

    D.have slowly disappeared

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    Because of climate change, the ice that polar bears depend on for survival       .

    A．are slowly disappearing
    B．is slowly disappearing
    C．are slowly disappeared
    D．have slowly disappeared

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    Because of climate change, the ice that polar bears depend on for survival _____．

    A．are slowing disappearing                    B．is slowly disappearing

    C．are slowly disappeared                        D．have slowly disappeared

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    阅读理解

    　　Polar bears depend on ice to hunt(猎取)for food in the Arctic Ocean．They climb up on the ice to look for seals and other animals．But scientists say sea ice is decreasing(减少)because of climate change．They say rising temperatures have reduces the area in which polar bears can hunt．

    　　Recently, a number of studies found that future reductions(减少)of sea ice could result in a loss(消失)of many polar bears within fifty years．The studies found a direct link between sea ice in the Arctic Ocean and the health of polar bears．The scientists say the animals will disappear from the north coasts of Alaska and Russia in the next fifty years．The only polar bears to survive will be in Canada's far north and the west coast of Greenland．

    　　The scientists found that almost two thirds of the world's nineteen polar bear populations will disappear from the earth by the middle of this century．The studies showed that three more groups of polar bears will disappear within seventy-five years．

    　　Scientists say polar bears still can be saved．But they say the world must begin taking steps to reduce climate change to do this．The center for Biological Diversity says governments around the world need to reduce the release(释放)of pollution like CO2 gas．

    　　Scientists say one step toward this goal would be to include polar bears on America's list of endangered(有危险的)species．Then the government would be able to make sure that industrial activities do not threaten their survival．The United States Fish and Wildlife Service is expected to examine the new findings when it considers whether polar bears should be included on the Endangered Species List．

    (1)

    In the future, which of the following places can be fit for Polar bear's existence?

    [　　]

    A．

    Canada's far north

    B．

    The west coast of Greenland．

    C．

    The north coasts of Alaska and Russia．

    D．

    Both A and B．

    (2)

    Which of the following is TRUE according to the passage?

    [　　]

    A．

    The living conditions of the polar bears are improving．

    B．

    Almost two thirds of polar bears will disappear within seventy-five years．

    C．

    The health of polar bears is directly connected with the sea ice．

    D．

    The polar bears mainly feed on sea ice．

    (3)

    According to the passage, the number of the polar bears is directly decided by ________．

    [　　]

    A．

    the climate change

    B．

    the amount(数量)of sea ice

    C．

    CO2 gas

    D．

    industrial activities

    (4)

    Whether polar bears should be included on America's Endangered Species List or not is decided by ________．

    [　　]

    A．

    the United States Fish and Wildlife Service

    B．

    the Center for Biological Diversity

    C．

    the polar bears themselves

    D．

    American government

    (5)

    This passage mainly tells us ________．

    [　　]

    A．

    the relationship between climate change and sea ice in the Arctic Ocean

    B．

    the influence of the weather change on the polar bears in the Arctic Ocean

    C．

    one step to save the endangered polar bears

    D．

    the fact that the number of the polar bears is decreasing

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    阅读理解。

         Polar bears live in the coldest environments on Earth-the Arctic. Called "ice bears"  in many
    European languages, polar bears depend on the ice that surrounds them for their survival. As the
    Arctic climate changes and the ice slowly disappears, polar bears face an increasingly uncertain
    future.
         Polar bears impress us with their incredible size, power and ability to survive in the cold Arctic.
    These giants can stand three meters tall and weigh over 500kg, and they spend their lives traveling
    throughout the Arctic. Two layers of fur keep them warm. Interestingly,the hairs are hollow in order
    to direct the sunlight straight to the skin. Undemeath their fur, polar bears have an
    additional l0-cm-layer of fat.
         Polar  bears  hunt  ringed seals (环斑海豹), which live under the Arctic ice. They wait patiently
    for hours beside holes in the ice pack (浮冰群) for seals to surface and breathe. Using their great
    strength , the bears pull the heavy animals up onto the ice. The seals provide much of the fat the
    bears need for warmth.
         Since 2006 , polar bears  have been  labeled  a vulnerable  (脆弱的) species. Most experts feel
    the threat to polar bears comes not from hunters or predators(食肉动物),but from the gradual melting
    of Arctic ice. Due to global climate change, the Arctic region is getting warmer. Arctic ice is breaking
    up earlier in the spring, and its area is decreasing.
         Problems polar bears around Canada's Hudson Bay are facing may indicate what lies ahead for
    polar bears elsewhere. Hudson Bay is located at the southern limit of the polar bears' territory(领地) .
         Currently,the ice there breaks up three weeks earlier in the spring than it did 20 years ago. Polar
    bears on Hudson Bay fast during the summer,waiting for ice to form in the fall to hunt. Every year,the
    Summer gets longer, and the bears get skinner. Over the past 25 years, the average weight of the
    female bears has dropped 68kg. This loss affects their ability to reproduce, and already the number
    of births has dropped 15% . Unless the bears can leam to survive global climate change, the giants
    of the ice may one day disappear.

    1. What puts polar bears in a challenging situation in the future?   
    A. More humans hunting in the Arctic.
    B. The warming climate and melting ice.
    C. The reducing number of food resources.
    D. The changing weather and new habitats.
    2. Paragraph 2 is mainly concemed with___________.   
    A. the description of polar bears
    B. polar bears' pattern of survival
    C. brief information on polar bears
    D. the types of polar bears
    3. Which description of polar bears is TRUE?    
    A. Polar bears are usually of medium size
    B. Polar bears feed mainly on ringed seals.
    C. In winter polar bears live under water.
    D. Polar bears travel beyond the Arctic in summer.
    4. The female bears have lost weight greatly in the past decades because___________.   
    A. there are a few ringed seals to hunt
    B. winter days are getting much longer
    C. they have to give birth to more young
    D. they have to wait longer before hunting
    5. We can feel that the author's tone for polar bears is__________.
    A. sympathetic                
    B. optimistic
    C. hopeful                        
    D. indifferent

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