D．Placebo.

　　答案：C　细节理解题。A、B、D三项中的物品是用来做实验的物品。在文章第四段最后一句“The researchers then measured levels of capsaicin, which is used in research to cause coughing and as a sign of how well the medicine are stopping coughs.”可知Capsaicin(辣椒素)用来引起咳嗽和作为这些药物如何止咳的依据。

　　3．We learn from the text that volunteers in the experiment ________.

　　A．were patients with bad coughs

　　B．were divided into the three groups

　　C．received standard treatments

　　D．suffered little side effects

　　答案：B　推理判断题。从第四段首句“Ten healthy volunteers were given theobromine, codeine or placebo, a pill that contains no medicine, during the experiment.”可知实验中每组人吃一种所给的物品才能看出止咳的效果，故需要三组志愿者。

　　4．Which of the following would be the best title for the text?

　　A．Codeine: A New Medicine

　　B．Chocolate May Cure Coughs

　　C．Cough Treatment: A Hard Case

　　D．Theobromine Can Cause Coughs

　　答案：B　归纳主旨题。本文主要介绍chocolate中含有的一种成分Theobromine能有很好的止咳效果，所以该题的正确答案为B。

　　B

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