血余炭的药用部位为（）
A．动物的干燥整体
B．除去内脏的动物体
C．贝壳类
D．脏器类
E．动物体某一部分的加工品
参考答案：E
Americans eat____ vegetables per person today as they did in 1990. [ ]
A. more than twice
B. as twice as many
C. twice as many as
D. more than twice as many
如果某种股票的预期年收入为每股10元，市场利率为10%时，则该种股票的价格为（）元。
A．50
B．100
C．150
D．200
