GWD 1-8

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.

1. an especially serious pollutant because it diminishes the respiratory system’s ability to deal
2. an especially serious pollutant because of diminishing the respiratory system’s capability of dealing
3. an especially serious pollutant because it diminishes the capability of  the respiratory system in dealing
4. a specially serious pollutant because it diminishes the capability of  the respiratory system to deal
5. a specially serious pollutant because of diminishing the respiratory system’s ability to deal

because of diminishing 不简洁，排除B,E。capability 加to，排除C。余下AD.

A中用system's，system不是人或动物，用这个所有格不错吗？ 答案是A，不是D，为什么？

请教XDJM, 感谢！！

the capability of doing

the capability of sb ,sthdoing

but D) is the capability of sth to do, so this answer is wrong

是因为especially和specially不同

一个作adv.修饰serious  一个表专门 特殊

但是这里specially也是修饰serious的吧？

俩词意思不一样