Question 5 is based on the following graph.[img]2014m11x/ct_egmatvj_egmatvlogic

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问题 Question 5 is based on the following graph.

Drug X, which kills on contact the bacteria that cause the infection, is administered to patients by means of an aerosol inhaler.
Which of the following, if true, contributes most to explaining the change in drug X’ s effectiveness during the course of the infection?

选项 A、Symptoms of the infection usually become evident during the first 48 hours following infection.
B、Most patients with lung infections say they prefer aerosol inhalers to other means of administering antibacterial drugs.
C、In most patients taking drug X, the dosage administered is increased slightly each week until symptoms disappear.
D、In patients who have the infection, the ability to inhale becomes increasingly impaired beginning in the second week after the onset of symptoms.
E、Drug X is not administered to any patient who shows signs of suffering from secondary infections.

答案 D

解析本题为解释图表题，重在抓住图表的变化点。(D)指出受感染的病人在第二周吸入药的能力受到损害，解释了第二周以后图的变化，因此(D)正确；(A)解释不了图的变化；(B)中病人的愿望与药的疗效无关；(C)易误选，但每周使用剂量的增加并无法解释上图中第二周后，图线下降趋缓的事实，所以(C)不对；(E)无关。

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