A. threat
C
Kiến thức: Cụm từ, đọc hiểu
Giải thích:
to be in danger: đang gặp nguy hiểm
Các từ còn lại: threat (n): mối đe doạ; problem (n): vấn đề, rắc rối; vanishing (n): sự biến mất
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From the passage, you can infer that a preservationist would be most likely to
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