单项选择题

On a number line，the distance between the two points with coordinates -5 and 1 is bow much 1ess than the distance between the two points with coordinates 2 and 14？（）

A. 6
B. 8
C. 10
D. 12
E. 16

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单项选择题
If the sum r+s is 2 less than the difference r-s，then s=（）

A. -2
B. -1
C. 0
D. 1
E. 2
单项选择题
On a certain number line，if-7 is a distance4 from n and 7 is a distance or 18 from n then n=（）

A. 25
B. 11
C. 3
D. -3
E. -11
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