单选题What is the main advantage of a rain barrel system?AIt benefits the Earth by recycling water.BIts efficiency increases in areas with little rainfall.CIt utilizes technology that is centuries old.DIt results in lower utility payments.
单选题
What is the main advantage of a rain barrel system?
A
It benefits the Earth by recycling water.
B
Its efficiency increases in areas with little rainfall.
C
It utilizes technology that is centuries old.
D
It results in lower utility payments.
参考解析
解析：
在第二段第一句“the most attractive aspect of rain barrel systems for many people is the potential monthly savings on water and wastewater bills”提到该系统可以节省水费。故D项符合题意。
在第二段第一句“the most attractive aspect of rain barrel systems for many people is the potential monthly savings on water and wastewater bills”提到该系统可以节省水费。故D项符合题意。
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