An investor buys two calls and one put on ABC stock, all with a strike price of $45. The calls cost $5 each, and the put costs $4. If the investor closes the position when ABC is priced at $55, the investor's per share gain or loss is :

A．

B．

C．

该病人麻醉前不能使用的药物是()。

A．安定

B．哌替啶

C．阿托品

D．地西泮

E．苯巴比妥钠