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问题 单项选择题

地高辛的正性肌力作用主要是由于( )。

A．激动心肌细胞卜的β1受体
B．增加心肌细胞膜反应性
C．抑制细胞膜结合的Na+-K+-ATP酶，使细胞内Ca2+增加
D．直接兴奋心脏上的交感神经
E．反射性兴奋交感神经

答案

参考答案：C

解析：[知识点] 强心苷类药物—地高辛的作用机制

单项选择题

There are two different options available with ITM Corporation common stock as the underlying asset. They each have the same maturity date, a strike price of $40.00, and are identical in all other ways except, one is a European call, and the other is an American call. ITM stock has a market value of $43.75. The American call option is selling for $4.90. For the European call, which of the following option premiums is most likely

A．

A. $4.90.

B．

B. $5.25.

C．

C. $4.25.
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