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更多问题
计算风险事件的期望值是通过（）。
A. 事件发生的可能性乘以事件发生的结果
B. 事件发生的可能性乘以风险事件的次数
C. 风险事件的数目乘以事件发生的结果
D. 风险最大的事件发生概率乘以风险最低的事件发生的可能性
2
A. The woman is watching an exciting film with the man.
B. The woman can't take a photo of the man.
C. The woman is running toward the lake.
D. The woman is filming the lake.
3
A. It's quiet in the restaurant.
B. The restaurant is too far from their school.
C. The price is high in the restaurant.
D. The restaurant serves good food.
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