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  3. Birds are a critical part of our ecological system. But more than ever, birds are threatened by human pollution and climate chan

Birds are a critical part of our ecological system. But more than ever, birds are threatened by human pollution and climate chan

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问题     Birds are a critical part of our ecological system. But more than ever, birds are threatened by human pollution and climate change.
    We need the birds to eat insects, move seeds and pollen around, transfer nutrients from sea to land, clean up after the mass death of the annual Pacific salmon runs, or when a wild animal falls anywhere in a field or forest.
    How could we enjoy spring without the birds flitting busily in our garden or dropping by to check out the flowers in our urban window box? Can you contemplate America without the soaring bald eagle, or even those scavengers like the pigeons and gulls that clean up discarded food scraps on our city streets and waterfronts? How diminished our lives would be without them?
    Scavenging eagles and condors need hunters to behave responsibly and bury, or remove, the remains of any shot deer peppered with fragments of lead bullets. Loons, ducks and other water birds will be poisoned by lead bullets and lead fishing sinkers if we allow such objects to drop in their feeding space.
    All sea and shore birds, even the puffins and guillemots of the otherwise pristine Aleutians, need us to make sure that no other heavy metals, like mercury and cadmium, are dumped in rivers and make their way across the oceans.
    Birds like the terns, knots and shearwaters that migrate between the far north and deep, deep, south of our planet need people everywhere to cease and desist from filling in their wetland fuel stops and rest stations, and from constructing golfing resorts and factories in their feeding and breeding grounds.
    Seabirds are among the most endangered vertebrate species on the planet, with the International Union for Conservation of Nature classifying 97 species as globally threatened, and 17 in the highest category of critically threatened. Of greatest concern are the pelicans of the southern oceans and the spectacular, but slow-breeding albatross.
    Plastic bags must be eliminated from natural environments so sea and shore birds don’t mistakenly carry such debris back to feed their chicks, with invariably lethal consequences. The albatross, cormorants and herons need us to stop over-fishing and compromising their normal food supply.
    The pelicans, penguins and all the birds that inhabit, or visit, our coastlines need us to ensure that we do not dump oil into gulfs and bays, or release so much carbon dioxide into the atmosphere that the oceans turn acidic and we lose the mussels and oysters, the mass of calcareous plankton that feeds so many creatures, and the coral reefs that nurture enormous numbers of edible species.
    Think about it: We share this small green planet. As they fly, feed and nest, the birds monitor the health of the natural world for us. provided that we, in turn, make the effort to access that key information.
    The birds and humans are both large, complex and ultimately vulnerable organisms that inhabit the top of the food chain. At the end of the day, their fate will be our fate.
What does the author intend to do in writing the passage?
选项 A、To evaluate our needs of birds to save our earth.
B、To describe various measures to protect the birds.
C、To criticize the effects of human pollution on birds.
D、To explain a basic tie between birds and human beings.
答案D
解析 主旨题。文章第一段指出鸟类是生态系统的关键一环，但是鸟类正遭到前所未有的人为污染和气候变化的威胁；二、三段介绍鸟类对生态环境、城市以及人类生活的重要性；四至九段介绍人类应该如何做来保护鸟类；最后两段再次点明鸟类和人类是相互依存的关系，最终，它们的命运就是我们的命运。可见作者写此文的目的是为了解释鸟类和人类的基本关系，故选D。
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