The researchers said that theobromine worked by keeping down a verve activity(神经活动), which caused coughing. They also found that unlike some standard cough treatments, theobromine caused no side effects such as sleepiness.

　　语篇解读：这是一篇科普性读物。选材于医学的某一方面的研究——对巧克力中theobromine(可可碱)独特的治疗咳嗽的功效的对比研究，证明theobromine(可可碱)是未来有效的治疗咳嗽的良药。

　　1．According to Professor Barnes, theobromine ________.

　　A．cannot be as effective as codeine

　　B．can be harmful to people's health

　　C．cannot be separated from chocolate

　　D．can be a more effective cure for coughs

　　答案：D　推理判断题。从第二段的“Their study found that theobromine, found in cocoa, was nearly a third more effective in stopping coughs than codeine, which was considered the best cough medicine at present.”可看出theobromine比codeine更有效，判断A项错误。既然它用来止咳，改善人们的生活质量，所以B项错误。在第一段提到了heobromine是从chocolate里提炼出来的，所以C项错误。故正确答案是D项。

　　2．What was used in the experiment to cause coughing?

　　A．Theobromine.

　　B．Codeine.

　　C．Capsaicin.

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