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
网友回答
A解析词义辨析。Exposed暴露；threatened威胁；constructed 建设；conserved保护，保存。句意：许多专家同意一旦这些宝藏暴露于空气中，会对他们造成很大的伤害。所以他们认为最好不发掘这些宝藏。所以选A。