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．exposedB．threatenedC．constructedD．conserved
A
詞義辨析。Exposed暴露；threatened威脅；constructed  建設；conserved
保護，保存。句意：許多專家同意一旦這些寶藏暴露于空氣中，會對他們造成很大的傷害。所以他們認為最好不發(fā)掘這些寶藏。所以選A。
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