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【题目】As there is less and less coal and oil, scientists are exploring new ways of making use of __________ energy, such as sunlight and water for power and fuel
A.primary
B.alternative
C.instant
D.unique

【答案】B
【解析】A.primary 首要的,初期的;B.alternativ有选择的,可替代的;C.instant立即的,迅速的;D.unique独特的,独一无二的;句意:既然煤和石油越来越少,科学家们正在研发新型的可替代的能源,如阳光和水。根据句意,故选B。

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