1.
Sulfur dioxide, a major contributor to acid rain, is an especially serious pollutant because it diminishes the respiratory system’s ability to deal with all other pollutants. (A) an especially serious pollutant because it diminishes the respiratory system’s ability to deal (B) an especially serious pollutant because of diminishing the respiratory system’s capability of dealing (C) an especially serious pollutant because it diminishes the capability of the respiratory system in dealing (D) a specially serious pollutant because it diminishes the capability of the respiratory system to deal（A） (E) a specially serious pollutant because of diminishing the respiratory system’s ability to deal 我知道has ability to do > has a capability of doing sth.请问就是这样才选A吗？可是A中respiratory system’s ability 也不是很好，不如the ability ( capability) of respiratory system 好。NN 请分析。 | 
