Questions 78-79

Despite improvements in treatment for asthma, the death rate from this disease has doubled during the past decade from its previous rate. Two possible explanations for this increase have been offered. First, the recording of deaths due to asthma has become more widespread and accurate in the past decade than it had been previously. Second, there has been an increase in urban pollution. However, since the rate of deaths due to asthma has increased dramatically even in cities with long-standing, comprehensive medical records and with little or no urban pollution, one must instead conclude that the cause of increased deaths is the use of bronchial inhalers by asthma sufferers to relieve their symptoms.

答案是A我可以理解。但C我还是有点疑问，一方面C确实可以support，但话说回来，题目中没有airborne pollen啊，不算一个无关选项么？如果无关的话就不support了啊。请教请教各位！

思路：现象：death rate doubled. 结论：the cause of increased death is ……

支持方向：

1，论据的有效性。

2，的确是这个原因。

A.        削弱, 人口double了，支持了two possible explanations之一，反对了结论。

B.         支持。中心，过去，现在一样accurate.

C.         支持结论，就是inhalers 造成的。

D.        同C。

E.         支持，排除可以削弱的他因（eg, Ten years ago bronchial inhalers were as many as that

used today. 就是削弱）。