单选题
If the successive tick marks shown on the number line above are equally spaced and if x and y are the numbers designating the end points of intervals as shown, what is the value of y?
If the successive tick marks shown on the number line above are equally spaced and if x and y are the numbers designating the end points of intervals as shown, what is the value of y?
【正确答案】
D
【答案解析】[解析] 从图中可以看出x处于O与y的之间，且[*]，所以当x=[*]时，可推知[*]，因此(1)是充分的；由[*]可得x点的坐标为[*]，所以y点的坐标为[*]，因此(2)也是充分的。