Question

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．primary

B．a(chǎn)lternative

C．instant

D．unique

Answer 1

B.

考查形容詞。既然石油和煤都越來(lái)越少，人們只好使用一些其它可替代這些燃料的東西，alternative 有“可選擇的，可替代的”之意，符合句意。primary“首要的，初期的”，instant“立即的，迅速的”，unique“獨(dú)特的”。