. 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

信用度是指企业在经济活动中履行诺言、讲求信誉的程度。对企业信用度的分析主要包括对企业借贷信用、（）、产品信誉等的评估。

A.企业还款记录

B.企业财务比率

C.经济活动信誉水平

D.经济合同履约信用