单项选择题

严守水资源“三条红线”的“红线”不包括（）。

A.开发利用
B.用水效率
C.水功能区限制纳污
D.运用技术处理废水

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单项选择题

If you have two issues to talk about to the same person, you’d better _______.
A、Write one email to cover both issues
B、Write two emails to talk abot them separately
C、Talk about one of them in an email first, and leave the other for sometime later.
D、Focus on the relation between the issues in one email

边际贡献首先用于补偿固定成本,之后若有余额,才能为企业提供利润。
正确
错误

答案：正确