阅读理解：（1）Once again seething residual anger has b

参考答案：

21) B：文章细节题：A选项(good grade)是年轻人所缺乏的，military training和national service都不提供，C选项(mutual trust)是national service所提供的，原文是“reconnect Americans to the rest of us.)，军事训练提供的是“对于能力的彼此尊重(mutual respect for each other’s abilities)，而不是mutual trust，所以C不对;D选项的work ethic和national service有关，原文是personal responsibility的复述，但这不是military training能提供的。B选项是两种形式都提供的，原文为：1)military training: in military life…, it is taught and learned in an atmosphere of discipline and earned … 2)with its emphasis on discipline….., national service can provide both the training….，这里两者都提到了discipline，和选项B自律是最大相似改写(self-discipline)，因此B选项是正确答案。

22) A：例证题：原文在提到父亲时的原文为：Discipline is the cornerstone of any responsible citizen’s life. 然后才提到自己父亲的经历，因此作者的例证应该是和discipline有关，故A选项是正确的。

23) A：取非题：B选项和C选项在文章中明确提到过，C选项(confidence and hope)是最后一句的改写：“national service can provide both the training and that first vital job that will reconnect these Americans with the rest of us.”，只有A选项(increase of income)在文章内没有提到过。故A选项是正确的。

24) B：指代题：问fire指代什么?在原文首段第一句中，作者指出：Once again, seething, residual anger burst forth in an American city. 这与末段最后一句，Let’s do it now before the fire next time是最大相似改写，由此可知，这里的fire应该指“怒火”，故B选项是正确答案。