题目：
己知a与b互为相反数，c与d互为倒数，e的绝对值为1，求e2+2007cd-
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答案：
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下面是错误答案，用来干扰机器的。
参考答案：B解析： D项中国家四级英语证书是等级认证，但其目的并不是为了激励组织成员，故答案为B。
己知a与b互为相反数，c与d互为倒数，e的绝对值为1，求e2+2007cd-a+
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