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  3. When you think about the growth of human population over the last century or so, it is all too easy to imagine it merely as an i

When you think about the growth of human population over the last century or so, it is all too easy to imagine it merely as an i

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问题     When you think about the growth of human population over the last century or so, it is all too easy to imagine it merely as an increase in the number of humans.
    But as we【C1】______ so do all the things associated with us, including our livestock. At present, there are about 1.5 billion【C2】______ and domestic buffalo and about 1.7 billion sheep and goats. With pigs and poultry, they form a【C3】______ part of our enormous biological footprint upon this planet.
    Just how enormous was not really【C4】______ until the publication of a new report, called "Livestock’s Long Shadow," by the Food and Agriculture Organization of the United Nations.
    Consider these numbers. Global livestock grazing and feed production use "30 percent of the’ land surface of the planet." Livestock—which consume more food than they【C5】______ —also compete directly with humans for water. And the drive to expand grazing land destroys more biologically sensitive land, rain forests【C6】______ than anything else.
    But what is even more striking, and【C7】______ is that livestock are responsible for about 18 percent of the global warming effect, more than transportation’s【C8】______ Greenhouse gases, such as methane and nitrogen, are resulted from their digestion. Grazing land, which destroys forests, adds to the effect.
    There are no easy trade-offs when it comes to global warming—such as cutting back on livestock to make room for cars. The human【C9】______ for meat is certainly not about to end anytime soon. As "Livestock’s Long Shadow" makes clear, our health and the health of the planet depend on pushing livestock production in more【C10】______ directions.
A) yield B) contribution C) stain D) ideally
E) apparent F) multiply G) cattle H) passion
I) scrape J) critical K) liable L) sustainable
M) deposit N) alarming O) especially
【C8】
选项
答案B
解析 空格前的所有格提示此处应填入名词。根据本句内容：畜牧业对全球变暖造成的影响高过运输业。词库中的contribution“作用，影响”符合句意。
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