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水是由氢原子和氧原子组成的。 Water ___________________...

水是由氢原子和氧原子组成的。

Water _______________________ hydrogen and oxygen atoms.

 

is made up of 【解析】 观察句子,这里缺少谓语部分,结合中文句意提示,表示“由......组成,构成”可用make up,注意句子结构,这里主语与谓语应该是被动关系,并且water是不可数名词,表述的是客观事实真理用一般现在时,谓语应该用三单形式,故答案为is made up of。  
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