准贷记卡透支期限最长不得超过( )。
A．60天B．90天C．30天D．15天
参考答案：A
They ________ the distance and the communication problem for people visiting their city.
A．drew attention to
B．used up
C．washed away
D．dreamed of
3，3，6，18，（）。
A．24
B．72
C．36
D．48
