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题库 / Prep2007E2-DS-54
If y is an integer and y = |x| + x, is y = 0 ?
(1) x < 0
(2) y < 1
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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y是整数...没考虑到这个条件。做题还是要仔细，把每个条件都要考虑到。
注意y是整数，当y
y is an integer........
这道题的条件二也是成立的，做的时候忽略了题目说了，y是整数，所以如果y是整数的话，x只能小于零的整数。