2. 外语
  3. Points P, R, and T lie on a straight line. The distance from P to R is 21, and the distance from P to T is 9. Column A

Points P, R, and T lie on a straight line. The distance from P to R is 21, and the distance from P to T is 9. Column A

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问题 Points P, R, and T lie on a straight line. The distance from P to R is 21, and the distance from P to T is 9.

Column A                          Column B
The distance from R to T          16
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 点P、R和T位于同一条直线上，P到R的距离是21，P到T的距离是9。比较R到T的距离与16。
解：本题的正确答案为(D)。因为题目中并未给出P，R和T的相对位置，所以T有两可能的位置：①T在P和R的中间，此时RT=12；②T和R在P的两侧，此时RT=30。
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