申购、赎回ETF的申购对价、赎回对价包括（）。
A．组合证券
B．现金替代
C．现金差额
D．其他对价
参考答案：A, B, C, D
Chinese President visited AIDS patients in Beijing's Ditan Hospital on the World AIDS Day, ________ was on Dec.1,2010, and ______ theme was to give all the AIDS patients medical care.
A．which; whose
B．which; of which
C．when; whose
D．on which, its
一种无色气体X和红热的木炭反应，得到另一种无色气体Y，Y和红热的氧化铁反应又得到X和Fe．下列合理的一组气体是（ ）
A．X为CO，Y为CO2
B．X为CO2，Y为CO
C．X为O2，Y为CO2
D．X为O2，Y为CO
