主题句往往在全文开头出现，通常标志分别为

　　1全文开头作者明确下结论、表立场的句子;

　　2全文开头引言后的解释;

　　3全文开头转折后的理论观点;

　　4全文开头故事背景后引出的第一个理论观点

　　例文1：14年1月

　　Humans should not try to avoid stress any more than they would shun food, love or exercise. Said Dr. Hans Selye, the first physician to document the effects of stress on the body. While heres on question that continuous stress is harmful, several studies suggest that challenging situations in which youre able to rise to the occasion can be good for you. 主题句

　　In a 2001 study of 158 hospital nurses, those who faced considerable work demands but coped with the challenge were more likely to say they were in good health than those who felt they couldnt get the job done.

　　Stress that you can manage also boost immune function. In a study at the Academic Center for Dentistry in Amsterdam, researchers put volunteers through two stressful experiences. In the first, a timed task that required memorizing a list followed by a short test, subjects through a gory video on surgical procedures. Those who did well on the memory test had an increase in levels of immunoglobulin A, an antibody thats the bodys first line of defense against germs. The video-watchers experienced a downturn in the antibody.

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