社会保险的投资原则是（）、（）、（）和（）。
参考答案：安全性原则、长期受益原则、多样化原则、可流动性原则
商业银行创新表外业务的直接动机是（）。
A、规避风险
B、逃避监管当局对资本金的要求
C、市场需求
D、追逐利润A、规避风险
D、追逐利润
The large size and roughly circular shape of the Pacific made some scientists think that it （） a hole left when the moon separated from the earth.
A. used to be
B. would have been
C. might have been
D. should have been
