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题库 / Prep2007E1-DS-168
On the number line, the distance between x and y is greater than the distance between x and z. Does z lie between x and y on the number line?
(1) xyz < 0
(2) xy < 0
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
这种题干给了主要条件之一，2个选项再分别给了条件的，先把题干的全部情况列出来，再用(1) (2) 分别去筛。
本题根据the distance between x and y is greater than the distance between x and z可以画出4组数轴，其中2组满足z在x,y之间；(1)，x,y,z 为1负或3负，4种数轴都可以符合，无法确定；(2)x,y一正一负，4种数轴都可以符合，无法确定；二者的交集是3种数轴组合，对应z的2种结果，无法确定。
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