绿地对城市生态环境的作用，下列叙述正确的是

【名词&注释】

生态环境(ecological environment)、日照时间(sunshine time)

[单选题]绿地对城市生态环境的作用，下列叙述正确的是

A. 调节城市大气碳氧平衡 有明显的增温降湿效应 减少城市地区日照时间 消除城市大气酸雨污染

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学习资料：

[单选题]He did not regret saying what he did but felt that he it differently.

A. could express
B. would express
C. could have expressed
D. must have expressed

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