单项选择题

If x2=68，which of the following could betrue（）

A. -9＜x＜-8
B. -8＜x＜-7
C. -8＜x＜8
D. 7＜x＜8
E. 9＜x＜10

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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
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
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