A:Here you are!
B:How do you find it?
C:It’s hard to say.
D:You must be joking!
①杜诗发明水排,用水力鼓风冶铁
②灌钢法
③青铜器的铸造
选择适当的关联词。
_____水再上涨,江堤_____有危险。( )