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【单选题】
在1个小时内,David可以洗2辆汽车或剪1块草坪,Ron可以洗3辆汽车或剪1块草坪。谁在洗汽车上有绝对优势?谁在剪草坪上有绝对优势?A.
David在洗汽车上有绝对优势，Ron在剪草坪上有绝对优势
B.
Ron在洗汽车上有绝对优势，David在剪草坪上有绝对优势
C.
David的绝对优势在洗汽车上，而不在剪草坪上
D.
Ron的绝对优势在洗汽车上，而不在剪草坪上
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A.
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B.
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C.
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