我国养老保险制度中规定，企业缴费划入个人帐户的比例为（）
A.4%
B.5%
C.3%
D.1%
E.8%
参考答案：C
在有理数范围内，把x4-64分解因式正确的是（ ）
A．（x2+8）（x2-8）
B．（x2+8）（x2+8）
C．（x2+4x+8）（x2-4x+8）
D．以上都不对
They are sorry to hear that the famous singer ______ for half an hour. [ ]
A. has left
B. has gone
C. has been away
D. has been
