38．B　细节理解题。在第五段中，作者对小男孩愿意来找他的原因进行了猜测：“Perhaps he simply needs someone to share his pain with，” I thought.“Perhaps he senses that I respect his suffering.”由此可知答案。

　　39．A　推理判断题。经过作者的治疗，David已经恢复了正常：started talking, got friends in school and joined a bicycle club，同时给作者写信描述了自己目前的生活以及对将来生活的打算。由此可知答案。

　　40．D　细节理解题。由文章可知，是作者的正确治疗方法，才使David恢复得那么好。他的方法就是：is to listen openly and sympathetically，具体的做法就是默默地和他下棋。

　　Air pollution is a leading cause of cancer and classified among Group 1,or top, human carcinogens (致癌物质), said the International Agency for Research on Cancer (IARC), which is the World Health Organization's (WHO) cancer agency, on Oct 17,2017. The most widely used system for classifying carcinogens comes from the IARC, which places them into five groups. Group 1 carcinogens definitely cause cancer in humans. Group 2A is probably carcinogenic to humans, Group 2B is possibly carcinogenic, the carcinogenicity of Group 3 in humans is unclassifiable, and Group 4 is probably not carcinogenic to humans. Only a little more than 100 are classified as Group 1 cancer-causing substances, including ultraviolet radiation and tobacco smoke. “Our task was to evaluate the air everyone breathes rather than focus on specific air pollutants,” the lARC's Dana Loomis said in a statement. “The results from the reviewed studies point in the same direction: the risk of developing lung cancer is significantly increased in people exposed to air pollution.”

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