将金融资产转变为现金的快慢程度,导致的在变现过程中出现损失的可能性,我们把这种风险称为证券投资的()。
A.经营风险
B.违约风险
C.流动性风险
D.购买力风险
参考答案:C
旅行社产品最基本的特征是()
A.季节性
B.同质性
C.综合性
D.易变性
---Has Tom finished his job yet?
---I have no idea of it; he _____ it this morning.
A.has been doing
B.had been doing
C.did
D.was doing