新加坡是典型的实行强制储蓄养老保险模式，并取得成功的国家。 （ ）
参考答案：对
寻常型银屑病可出现：
A．水痘B．传染性软疣C．扁平疣D．天疱疮E．带状疱疹
Over a very large number of trials, the probability of an event ________ is equal to the probability that it will not occur.
A．occurring
B．to occur
C．occurs
D．occur
