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单选题
One advantage of nano-armed washing machines is that ______.
A
one wash-load could be much larger than before
B
the clean-up is done with an additional benefit
C
cleaning powder is no longer necessary
D
a lot of water could be saved
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参考解析
解析：
细节题。结合文章第一段中提到，纳米洗衣机比普通洗衣机更能除菌去味；最后一段中作者又提到纳米产品为三星公司带来77.9亿美元的收益，因此纳米洗衣机的一大优点是拥有带来丰厚的利润的清洁技术。故选B。
细节题。结合文章第一段中提到，纳米洗衣机比普通洗衣机更能除菌去味；最后一段中作者又提到纳米产品为三星公司带来77.9亿美元的收益，因此纳米洗衣机的一大优点是拥有带来丰厚的利润的清洁技术。故选B。
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