20.Something in chocolate could be used to stop coughs and lead to more effective medicines,say UK researchers.
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.
The Imperial College London researchers who published their results online said the discovery could lead to more effective cough treatment."While coughing is not necessarily harmful,it can have a major effect on the quality of life,and this discovery could be a huge step forward in treating this problem,"said Professor Peter Barnes.
Ten healthy volunteers were given theobromine,codeine or placebo,a pill that contains no medicine,during the experiment.Neither the volunteers nor the researchers knew who received which pill.The researchers then measured levels of capsaicin,which is used in research to cause coughing and as a sign of how well the medicine is stopping coughs.
The team found that,when the volunteers were given theobromine,the capsaicin needed to produce a cough was around a third higher than in the placebo group.When they were given codeine they need only slightly higher levels of capsaicin to cause a cough compared with the placebo.
The researchers said that theobromine worked by keeping down a nerve activity (神經(jīng)活動),which causes coughing.They also found that unlike some standard cough treatments,theobromine caused no side effects such as sleepiness.
24.According to Professor Barnes,theobromineD.
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
25.We learn from the text that volunteers in the experimentB.
A.were patients with bad coughs
B.were divided into three groups
C.received standard treatments
D.suffered little side effects
26.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.

分析 本文主要是講巧克力中發(fā)現(xiàn)的theobromine(可可堿)可以用來治愈咳嗽.

解答 24.D 細節(jié)理解題.根據(jù)文章第二段that theobromine(可可堿),found in cocoa,was nearly a third more effective in stopping coughs than codeine,說明他們認為theobromine是一種有效的治療咳嗽的方法.故D正確.
25.B 細節(jié)理解題.根據(jù)第四段1,2行Ten healthy volunteers were given theobromine,codeine or placebo,a pill that contains no medicine,during the experiment.說明他們被分成三隊,每一隊都服用不同的東西.故B正確.
26.B 主旨大意題.根據(jù)文章第一段說明本文主要是講巧克力中發(fā)現(xiàn)的某種物質(zhì)可以用來治愈咳嗽.故B正確.

點評 本文是一個科教類閱讀,題目涉及多道細節(jié)理解題,做題時結(jié)合原文和題目有針對性的找出相關(guān)語句進行仔細分析,結(jié)合選項選出正確答案.推理判斷題也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確答案,切忌胡亂猜測,一定要做到有理有據(jù).

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