The major reason why Americans enjoy an abundant food supply is that the arable land at their disposal for food production is __

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问题 The major reason why Americans enjoy an abundant food supply is that the arable land at their disposal for food production is ______.

选项 A、three times more the world average
B、three times as much the world average
C、three times the world average
D、the world average is three times

答案C

解析
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