2. 外语
  3. Common indoor plants may prove to be a valuable weapon in the fight against rising levels of indoor air pollution. Those【C1】____

Common indoor plants may prove to be a valuable weapon in the fight against rising levels of indoor air pollution. Those【C1】____

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问题     Common indoor plants may prove to be a valuable weapon in the fight against rising levels of indoor air pollution. Those【C1】______in your office or home are not only【C2】______, but NASA scientists are finding them to be【C3】______Useful in absorbing potentially harmful【C4】______and cleaning the air inside modern buildings.
    NASA and the Associated Landscape Contractors of America(ALCA)have【C5】______the findings of a 2-year study that【C6】______the common indoor plant may provide a natural way of helping【C7】______"Sick Building Syndrome."
    Research【C8】______the use of biological processes as a means of solving environmental problems, both on the【C9】______and in space habitats(栖息地), has been【C10】______out for many years by Dr. Bill Wolverton,【C11】______a senior research scientist at NASA’s John C. Stennis Space Center, Bay St. Louis, Miss.
    Based on preliminary evaluations of the use of common indoor plants for indoor air purification and revitalization(恢复活力), ALCA【C12】______NASA to fund a study using about a dozen popular varieties of ornamental plants to determine their【C13】______in removing several key pollutants associated with indoor air pollution. NASA research on indoor plants has found that living plants are so【C14】______at absorbing contaminants in the air that some will be launched into【C15】______as part of the biological life support system aboard future orbiting space stations.
【C16】______research is needed, Wolverton says the study has shown that common indoor landscaping plants can remove【C17】______pollutants from the indoor environment. "We feel that future results will provide an even【C18】______argument that common indoor landscaping plants can be a very effective part of a system used to provide pollution【C19】______homes and work places," he【C20】______.
【C16】
选项 A、While
B、So
C、Since
D、For
答案A
解析 此空所在的句子中，research is needed 和 the study has shown that common indoor landscaping plants can remove．．．pollutants from the indoor environment之间是让步关系，所以选While。
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