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【单选题】
下列关于期权的说法中，正确的是（ ）。A.
实物期权中扩张期权属于看涨期权而时机选择期权和放弃期权属于看跌期权
B.
对于看涨期权来说，期权价格是随着股票价格的上涨而上涨，当股价足够高时期权价格可能会高于股票价格
C.
假设影响期权价值的其他因素不变，股票价格上升时以该股票为标的资产的欧式看跌期权的价值下降，股票价格下降时以该股票为标的资产的美式看跌期权价值上升
D.
对于未到期的看涨期权来说，当其标的资产的现行市价低于执行价格时，该期权处于虚置状态，其当前价值为零
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【单选题】Even in the absence of express instructions，the authority of the master of a ship is very large and ______ to all acts that are usual and necessary for the employment of the ship．
A.
expends
B.
spreads
C.
extends
D.
enlarges
【单选题】The writer mentions the examples of Hitler and Mussolini to show that ______.
A.
even the most cultured nation could produce dictators
B.
massive popular support does not guarantee truth
C.
they had the power of arousing people's emotion
D.
they were both good at using faulty logic
【简答题】The author seems to believe that even in the absence of credit cards, some people would undoubtedly ______.
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