| 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 |
| E. a specially serious pollutant because of diminishing the respiratory system's ability to deal |
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发表于 2010-1-6 11:44:50
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