A:①④
B:①③
C:②④
D:③④
A是一个五次多项式,B是一个五次单项式,则A-B一定是( )
根据汉语意思完成句子
下图为城市建设前后水循环示意图。读图回答下列各题。
— I can't stand (忍受) the air pollution in this city any more. It is getting more terrible.
— ________. We've never had so many factories before.