25. There should be a greater use of gasohol. Gasohol is a mixture of alcohol and gasoline, and has a higher octane rating and fewer carbon monoxide emissions than straight gasoline. Burning gasohol adds no more carbon dioxide to the atmosphere than plants remove by photosynthesis.

Each of the following, if true, strengthens the argument above EXCEPT:

A. Cars run less well on gasoline than they do on gasohol.

B. Since less gasoline is needed with the use of gasohol, an energy shortage is less likely.

C. Cars burn on the average slightly more gasohol per kilometer than they do gasoline.

D. Gasohol is cheaper to produce and hence costs less at the pump than gasoline.

E. Burning gasoline adds more carbon dioxide to the atmosphere than plants can remove.

答案是C。解释：首先领会本argument的结论是：There should be a greater use of gasohol。根据提议，要选支持选项，即选出支持多使用gasohol的选项：

A: 用gasoline的汽车不如用gasohol的汽车好，起到支持作用

B: 说明使用gasohol能够降低发生能源短缺的可能性，当然起到支持作用

C: 汽车行驶一公里平均需要使用的gasohol比gasoline多，这说明了gasohol的一项劣势，不能起到支持作用

D: gasohol比gasoline具有较低的成本，支持。

E: 燃烧gasoline产生的二氧化碳比植物能消化的多，而argument中说gasohol产生的二氧化碳不比植物光合作用时能移除的多，所以优势显而易见。

E选项不理解。E为什么指出了与题目里不符的论点呢? 有这样问的吗？如果如E所说，燃烧gasoline产生的二氧化碳比植物能消化的多，那不是个劣势吗？