The farmers are very worried, because a lot of crops have ___________ for lack of rain.
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As autumn _________ near, the cornfields showed signs of ripeness.
You have to _________ it that all the little leaks have been shut off.
按履约方式不同，期权可以分为
A. 美式期权
B. 欧式期权
C. 看涨期权
D. 看跌期权
期权费的决定因素包括
A. 合约的有效期
B. 期权的约定汇率
C. 预期汇率的波动幅度
D. 期权供求状况
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