2. 外语
  3. As concerns over man’s impact on the global environment increase, many interesting innovations are being considered. For example

As concerns over man’s impact on the global environment increase, many interesting innovations are being considered. For example

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问题 As concerns over man’s impact on the global environment increase, many interesting innovations are being considered. For example, "green roofs" - plant-filled roof top gardens - are one substantial way to confront the country’s ecological problems, and there seems to be very little in the way of a downside. For one thing, a green roof acts as a sponge for rainwater, absorbing the majority of water from a typical rainstorm. Only three to five inches of soil for a green roof is sufficient for this to occur, which keeps the weight of the roof to a minimum. Because the plantings on the roof absorb the rainwater, drainage and sewage systems have a decreased volume of water pumping through them, keeping these systems from becoming over-stressed. And while the soil and plants are absorbing rainwater, they are also taking in pollutants for their own nourishment by storing carbon and then emitting necessary oxygen back into the atmosphere.
The author references the absorption capabilities of green roofs primarily in order to illustrate
选项 A、a preoccupation with style over design practicality
B、the inefficiencies of installing plantings to a building’s roof
C、how green roofs lead to more efficient and less-stressed home systems
D、the increased public interest in environmental friendliness in the construction industry
E、how global warming has accelerated society’s interest in environmentally friendly structures
答案C
解析 The best answer is C. The passage focuses on specific examples of how the green roofs would work. The other answer choices are outside the scope of the passage.
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