Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có đầy đủ đáp án (Đề 3)
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Chemicals are easily if they are laid open in the atmosphere for a long time. (action)

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Chemicals are easily ……………………if they are laid open in the atmosphere for a long time. (action)

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Đáp án: Chemicals are easily deactivated if they are laid open in the atmosphere for a long time.