What is the main subject of this passage? One disadvantage of reusing treated wastewater is .

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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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