问题
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What does the word precursor in the context in the second paragraph mean？
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The word“plummet” 查看材料A.decrease in paragraph 6 mea
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Fill in the blank in Paragraph 5 with proper words. （within 5 words)
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The word“collapsed”in paragraph 4 most probably m
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The word“affect”in Paragraph 6 could be best repl
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In the first paragraph the word“environments”coul
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