高温可不可以去掉水里的氯成分

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• 改错不懂!The problems that are created by environmental contamination are very hard to resolve.我总觉得这句话不通,为什么第一个are可以要呢?可不可以讲that后面的那个are去掉呀?书上原题是：The problems that are created by environmental contamination is very hard to resolve.然后改为这：The problems that are created by environmental contamination are very hard to resolve.可是我觉得改过的也不懂，总觉得第一个are怪怪的，还有that是个什么从句呢？如果是从句，那第一个are在句子中是什么成分呀？
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• 高温可不可以去掉水里的氯成分
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• 高温可不可以去掉水里的氯成分
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