Dick ___________in America, but now he has been_______Chinese food since he moved to Wuxi.

A．used to live; used to eating

B．is used to live; used to eat

C．is used to living; used to eating

D．used to living; used to eat

牛市中，投资者预计后市股票上涨幅度有限，或股价回涨只是跌势反弹，此时投资者最好的操作策略是（）。

A.牛市价差期权策略

B.买入认购期权

C.卖出认购期权

D.卖出认沽期权