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题库 / Prep2007E1-DS-178
If there are more than two numbers in a certain list, is each of the numbers in the list equal to 0 ?
(1) The product of any two numbers in the list is equal to 0.
(2) The sum of any two numbers in the list is equal to 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.
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在选项（2）里，如果有－1和1呢？
那就有两个数不等于0，别的0和这两个数相加就不会为0
比如只有三个数，-1，1和0，不能保证除-1和1相加为零后，其他的数相加也为0
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