听觉障碍是否导致言语障碍，取决于：（）
参考答案：障碍发生的年龄
______ it was very cold, ______ he went out without an overcoat. [ ]
A. Although; but
B. Though; but
C. /; though
D. Though; /
预授权类交易只有进行（）操作，特约商户才能收到交易款项。
A、预授权
B、预授权撤销
C、预授权完成
D、预授权完成撤销
