. Many experts agree that once these treasures are to the air, great harm will be done to them. So they think it better not to unearth the treasures. A. exposed B. threatened C. constructed D. conserv 题目和参考答案——青夏教育精英家教网—

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. Many experts agree that once these treasures are _______ to the air, great harm will be done to them. So they think it better not to unearth the treasures.

A. exposed B. threatened C. constructed D. conserved

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