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组胺受体阻断剂E．

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Every option transaction involves______.

A. exercise
B. both a put and a call
C. a buyer and a seller
D. all of the above

眼部主眼肌受累，致上睑下垂、运动障碍等E．

肝肾亏虚，阴精不足，筋脉失养，形成痿证者，选方为E．

If the expected returns of two risky assets have a perfect negative correlation, then risk

A. is increased
B. is unaffected
C. falls to zero
D. is reduced by one-half