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For hot desert locations with access to seawater, a new greenhouse design
generates freshwater and cool air. Oriented to the prevailing wind, the front
wall of perforated cardboard, moistened and cooled by a trickle of seawater
pumped in, cools and moistens hot air blowing in. This cool, humidified air
accelerates plant growth; little water evaporates from leaves.
Though greenhouses normally capture the heat of sunlight, a double-layered
roof, the inner layer coated to reflect infrared light outward, allows
visible sunlight in but traps solar heat between the two layers. This heated
air, drawn down from the roof, then mixes with the greenhouse air as it
reaches a second sea - water-moistened cardboard wall at the back of the
greenhouse. There the air absorbs more moisture, which then condenses
on a metal wall cooled by seawater, and thus distilled water for irrigating
the plants collects.
It can be inferred that the greenhouse roof is designed to allow for which of
the following?
B. The entry of sunlight into the greenhouse to make the plants grow
答案有選這一項
但是文章裡沒提到是要給植物生長阿@@?
只說allows visible sunlight in ?
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