所有国家都允许选择的社保基金投资方式，除国债外，还有( )
A．银行存款
B．不动产
C．企业债券
D．国债
参考答案：A
On his way to the airport，it ________him all of a sudden that he had forgotten his passport.
A．hit
B．knocked
C．occurred
D．beat
我国GB2828规定，计数多次抽样检查的抽检次数为()
A．4
B．5
C．6
D．7
