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The pronoun "it"in the sentence "It is not widely known in the United States" (Para. 5)may
The pronoun "it"in the sentence "It is not widely known in the United States" (Para. 5)may refer to____.
A.an International Climate Protection Award
B.the EPA,that is,the U.S. Environmental Protection Agency
C.the refrigerator project mentioned in the passage
D.the mass purchasing program for Chinese government agencies