【正确答案】 A

【答案解析】本题问第三段第二行"depleted"一词可以被下面哪个词替换。该词所在句的前半句“They could accurately be called‘renewables’”，说明它们是可再生的，紧接着用"since"给出原因“nothing is depleted to make them．”，然后对此做进一步解释“They would be part of the natural carbon cycle，borrowing that dement from the atmosphere for a few months，and returning it when they were burned or dumped．”这说明在生产它们的时候没有什么东西被消耗掉，只是进行了自然界的碳循环，故[A]“被消耗掉”正确。 [B]丢弃；[C]放弃；[D]浪费：均不合文意。