单选题
A rectangular floor 18 feet by 10 feet is to become pletely covered with carpeting that costs x dollars per square yard．In terms of x，how many dollars will the carpeting cost?(1 yard=3 feet)
A. 20x B. 28x C. 60x
D. 180x E. 540x
A
B
C
D
E
【正确答案】
A
【答案解析】
一长为18英尺，宽为10英尺的长方形地板要全部铺上每平方码x美元的地毯。以x为单位，地毯总共需花多少钱?(1码=3英尺1
解答该题时，考生一定要注意前后单位的变化，一时疏忽很易选(D)。考虑单位变化，[*]
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