To reduce emissions of greenhouse gases, many countries are increasing the use of natural gas, wind and other forms of _______ energy.
A．a(chǎn)bandonedB．originalC．a(chǎn)lternativeD．precious
C

試題分析：A. abandoned被放棄的，被遺棄的，熱情洋溢的，B. original 最初的，原始的，C. alternative可替換的，可供選擇的， D. precious珍貴的，句意：為了減少溫室氣體的排放，很多國家在增加天然氣，風(fēng)和其他可替代能源的使用。所以選C。
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