徽商银行信用卡的有效期为（）
A.2年
B.3年
C.4年
D.5年
参考答案：B
填写单位：玉林同学身高170______，一只鸡蛋的质量为50______．
30. When he was only thirty years old, he had already experienced______most people only experience when they are much older.
A．what
B．which
C．who
D．When
