问题描述：
用定语从句改写下列句子：1,It is well known that human activiti
1,It is well known that human activities contribute to the global warming.
2,He made rapids progress in his study,and it was a great comfort to his mother.
3,Pop music is such an important part of society that it has even influenced our language.
1,It is well known that human activities contribute to the global warming.
2,He made rapids progress in his study,and it was a great comfort to his mother.
3,Pop music is such an important part of society that it has even influenced our language.
问题解答：
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