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Plants are more efficient at acquiring carbon than are fungi, in the form of carbon dioxide, and converting it to energy-rich sugars.

1. Plants are more efficient at acquiring carbon than are fungi
2. Plants are more efficient at acquiring carbon than fungi
3. Plants are more efficient than fungi at acquiring carbon
4. Plants, more efficient than fungi at acquiring carbon
                           (无谓语)
5. Plants acquire carbon more efficiently than fungi
                       （与后面的and 不对称了）

我觉得C和B没有区别,希望指教