证券市场失效的原因是（）。
A、流动性丧失
B、卖出远远大于买入
C、杠杆资金被动平仓
D、以上均是
参考答案：D
An increasing number of products made in China are good quality but much less expensive than those from abroad.
A．on
B．in
C．for
D．of
从字幕的呈现方式看，字幕分为（）字幕和（）字幕两种。
