大全676， 兼问capabilty和ability，specially和especially

675.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

答案是A， capability和ability有什么区别？ especially和specially呐？这里到底是那一组决定了选A而非D？

especially vs specially 在Logman上给出的解释：

Especially is most often used to emphasize something, or to say that something is more worth mentioning or more important than the other things you are talking about: It can be especially difficult for drivers to see cyclists at night. | The town is especially crowded in the summer (=much more than in winter). I hate interruptions, especially when I'm trying to work (=I do not mind as much at other times). Specially is usually used when you do something that is different from what you usually do for a particular purpose. It is often used with the passive form of a verb: a specially made/designed/adapted etc car | I bought it specially for you

1.capability to do (Longman)

2.specially只有：for a particular purpose, and only that purpose的意思；

especially有：a particular high degree or more than usual的意思 （Longman）。

这题有点变态，考搭配和词义？!