苦寒有小毒，不宜持续及过量服用的药物是
A．全蝎
B．苦参
C．花椒
D．吴茱萸
E．川楝子
参考答案：E
在锐角△ABC中，AC=1，B=2A，则BC的取值范围是______．
All else being equal, a decrease in expected yield volatility would most likely cause the price of:（）
A. both a callable bond and a putable bond to decrease.
B. a callable bond to increase and the price of a putable bond to decrease.
C. a callable bond to decrease and the price of a putable bond to increase.
