On the number line, 1.4 is halfway between which of the following pairs of numbers?

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问题 On the number line, 1.4 is halfway between which of the following pairs of numbers?

选项 A、-1.4 and 2.4
B、-1 and 2
C、-0.3 and 3.1
D、0. 15 and 1. 55
E、0. 4 and 1

答案C

解析在数轴上，1.4是下面哪一对数的中点?
解：本题的正确答案为(C)。在数轴上，若一点是另外两点的中点，则该点的坐标应是另外两点坐标的和的一半。根据这条定理，可以推出1.4是-0.3和3.1两点的中点。

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