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  3. The first paragraph mainly tells us that According to Dr. Liu’s paper, the dwindling of biodiversity is due to

The first paragraph mainly tells us that According to Dr. Liu’s paper, the dwindling of biodiversity is due to

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问题 The first paragraph mainly tells us that
According to Dr. Liu’s paper, the dwindling of biodiversity is due to
选项 A、the reduction in average home size.
B、the improvement of living conditions.
C、the increasing number of residences.
D、the decline of population growth rate.
答案C
解析 本题问根据Dr. Liu的文章生物多样性减少是什么原因造成的。第二段第一句"…a greater number of individual households，each containing on average fewer people，meant more pressure on natural resources"表明，家庭总量激增，家庭成员减少，意味着对自然资源的压力加大。可以推断其结果必然造成生物多样性减少。所以"住宅数量的不断增加"正确。家庭房屋平均面积的缩小：文中所说的是家庭成员的减少(smaller households)，而不是家庭居住面积的减小。见文中"Paradoxically，smaller households do not mean smaller homes"．居住环境的改善：第二段中间谈到"Each household needed fuel to heat and light it；each household required its own plumbing，cooking and refrigeration"，但这里讨论的并不是居住环境的改善，而是论述小家庭与大家庭相比更浪费资源，从而说明这种家庭结构会对资源环境造成压力。人口增长率的降低：这对于生态环境而言起正面作用，不会造成生物多样性的减少。
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