所有的男性都很健康，没有吸毒或者抽烟的人，他们都被要求在研究期间避免吃喝有味道的东西。所以本句中的“abstain from”意为“avoid”故C正确。

　　7. D 推理判断题。根据倒数第二段最后两句Happiness perfumes, for instance, could be invented. Scent therapies（香味疗法）could also be developed to help people through depression or anxiety. 可知这项研究结果可以让生产出幸福香水，香味疗法可以帮助人们度过压抑和焦虑的情绪。也就是说一些味道可以让我们的情绪更好。故D正确。

　　考点：考查科普类短文阅读

　　You’re probably aware of the basic trends. The financial rewards to education have increased over the past few decades, but men fail to benefit.

　　In elementary and high school, male academic performance is lagging. Boys earn three-quarters of the D’s and F’s. By college, men are clearly behind. Only 40 percent of bachelor’s degree go to men, along with 40 percent of master’s degree.

　　Thanks to their lower skills, men are dropping out of the labor force. In 1954, 96 percent of the American men between the ages of 25 and 54 worked. Today, that number is down to 80 percent. In Friday's jobs report, male labor force participation reached an all-time low.

　　Millions of men are collecting disability benefits. Even many of those who do have a job are doing poorly. According to Michael Greenstone of the Hamilton Project, annual earnings for average prime-age males have dropped by 28 percent over the past 40 years.

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