Q27:
If x and z are integers, is at least one of them even?
(1) x + z is odd.
(2) x - z is odd.
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is
sufficient.
D. EACH statement ALONE is sufficient.
答案d. 我觉得应该是e.因为x+(-) z为奇数时，应该得不出至少x,z其中之一是偶数，如果两者都是偶数就不对。 | 
