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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
【C3】
选项
答案J
解析 空格处应为名词、形容词或分词作part的定语。本句表明牲畜是地球物种的组成部分，critical“关键的”符合句意。
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