6. As there is less and less coal and oil, scientists are exploring new ways of making use of   energy, such as sunlight, wind and water for power and fuel.
A．primaryB．a(chǎn)lternativeC．instantD．unique
 B

Primary初等的；最初的；alternative可供替代的，可選擇的；instant 立即的，即刻的； unique 單獨(dú)一無二的，由常識可知，陽光、風(fēng)力及水力都是不可能替代能源。
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