(单选题)

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A.poor

B.rich

C.dirty

D.clean

参考答案：D

参考解析：

考查上下文语境及形容词辨析。句意：随着研究清洁能源的聪明学生越来越多，我们可以更快地从煤炭和汽油过渡到氢能或太阳能。poor意为“贫穷的”；rich意为“富裕的”；dirty意为“脏的”；clean意为“干净的”。根据后文可知“from coal and gasoline to hydrogen or solar power much more quickly.”可知此处表示越来越多的学生研究清洁能源。故选D。

知识点：

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