Psychological research indicates that college hockey and football players are more quickly moved to hostility and aggression than are college athletes in noncontact sports such as swimming. But the researchers’ conclusion—that contact sports encourage and teach participants to be hostile and aggressive—is untenable. The football and hockey players were probably more hostile and aggressive to start with than the swimmers.
Which of the following, if true, would most strengthen the conclusion drawn by the psychological researchers?
(A) The football and hockey players became more hostile and aggressive during the season and remained so during the off-season, whereas there was no increase in aggressiveness among the swimmers.
(B) The football and hockey players, but not the swimmers, were aware at the start of the experiment that they were being tested for aggressiveness.
(C) The same psychological research indicated that the football and hockey players had a great respect for cooperation and team play, whereas the swimmers were most concerned with excelling as individual competitors.
(D) The research studies were designed to include no college athletes who participated in both contact and noncontact sports.
(E) Throughout the United States, more incidents of fan violence occur at baseball games than occur at hockey or football games.
正确答案是A，我也选对了，但总觉得A不是很舒服，想不明白，麻烦各位解释一下选A的道理吧。
文章结构如下：先说研究者的结论是橄榄球和曲棍球的球员比起游泳运动员更加好斗（说明是一种常态，一向如此），然后又反驳了研究者的理论，反驳的论据是橄榄球和曲棍球运动员只是在比赛开始的时候好斗而已（意味着并非常态）。
题目要求加强心理学研究者得出的结论，即加强橄榄球和曲棍球运动员更加好斗（同时也即削弱反对者的论调－－并非常态）。
A说无论赛季或非赛季，橄榄球和曲棍球的球员比起游泳运动员都更加好斗（即用常态加强），同时也虚弱了反对者的非常态论调，非常完美的答案！
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