选择题:In the common interest of protecting the nature, a

题目内容:
In the common interest of protecting the nature, a lot of governments have been united to abolish the ____pollution caused by chemical industry.(poison)
参考答案:

、( )是由债务人向债权人发出的,承诺在一定时期内支付一定款项的债务凭证。

、( )是由债务人向债权人发出的,承诺在一定时期内支付一定款项的债务凭证。A 期票B 汇票C 本票D 支票

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