gwd-4-3 这题没有人问

If k, m, and p are integers, is k – m – p odd?

(1)     k and m are even and p is odd.

(2)     k, m, and p are consecutive integers.

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.

E. Statements (1) and (2) TOGETHER are NOT sufficient

答案是A. 问一个愚蠢的问题, 负数也有奇偶性吗. 不好意思,本人离开学校太久, 又是学文科的. 先谢过了.

负数也有奇偶性

(1)     k and m are even and p is odd.

偶+偶-奇=奇

充分

(2)     k, m, and p are consecutive integers.

分两种:奇+偶－奇=偶

　　　偶＋奇－偶=奇

不唯一

所以选Ａ

推荐ＭＭ看下下钱永强的那本数学书，上面对一些基本概念都有解释的，ＣＤ的下载区就有这本书的PDF版本下．

祝ＭＭ好运！