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What is the main subject of this passage? One disadvantage of reusing treated wastewater is .
What is the main subject of this passage? One disadvantage of reusing treated wastewater is .
admin
2014-09-19
38
问题
What is the main subject of this passage?
One disadvantage of reusing treated wastewater is .
选项
A、its cost is too high
B、its productivity is too low
C、the resulting water is not ultra-pure
D、the method is not logical
答案
A
解析
细节题。倒数第二段最后一句,But the technology to make ultra-pure water for such a closed-loop system is still too costly.……这一技术的成本仍太高了。A符合这个意思。
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