[img]ct_gre5image036[/img]Column A Column BThe length o

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问题

Column A Column B
The length of arc ABC The length of arc ADC

选项 A、if the quantity in Column A is greater
B、if the quantity in Column B is greater
C、if the two quantity are equal
D、if the relationship cannot be determined from the information given

答案 D

解析本题的正确答案为(D)。由BC=AD=x，只能推出它们的对应弧长BC，AD相等，但是AB弧与CD弧的长度却不能确定，因此本题的为无法判断。只有当BC∥AD时才能得到ABC弧的长度与BCD弧的长度相等。(BC=AD保证了与圆心等距)。

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