A、It may not prove an environmental crisis at all.
B、It is an issue requiring worldwide commitments.
C、Serious steps have been taken to avoid or stop it.
D、Very little will be done to bring it under control.
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正确答案
试题解析
根据Excerpt 2内容可知,全球变暖有可能成为21世纪的环境危机,但是无论结果如何,我们都无能为力。故D项为正确答案。