广义上的风险是指未来结果的不确定性，其中( )又被称为危险。
A．收益风险
B．纯粹风险
C．自然风险
D．投机风险
参考答案：B
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It is well-known that humans differ _____ other mammals in their ability to speak.[ ]
A. with
B. between
C. onto
D. from
