单项选择题
A.harmful
B.disastrous
C.harmless
D.poisonous
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单项选择题
A.existedB.discoveredC.createdD.manufactured
A.existed
B.discovered
C.created
D.manufactured
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单项选择题
A.lettersB.correspondenceC.postD.attachments
A.letters
B.correspondence
C.post
D.attachments
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