关键是前一句:These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil on a global basis. 这就是答案之所在. 和数量没有什么关系. ok?
"These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil on a global basis. 这就是答案之所在"
stanhope,
The above sentence is talking about the nature,nothing about the polution made by population. The answer D is talking about people,which cannot get from this sentence.
Robshu, the senantance is really talking about nature. but do u tkjnow what "these" means? and in the latter, the passage discussedt the quantuty from nature greatly dwart f that of human beings. and so the compound by nature and by human beings are thus related. if the compound from narture is purifing the air. o so does that of human being.
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发表于 2005-8-2 14:01:00
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