A. 风险和不确定性有显著的区别
B. 风险涉及到变动和可能性
C. 变动常常可以用标准方差来表示
D. 标准方差越大,投资风险也就越小
E. 不确定性的大小可以量化
A. 风险和不确定性有显著的区别
B. 风险涉及到变动和可能性
C. 变动常常可以用标准方差来表示
D. 标准方差越大,投资风险也就越小
E. 不确定性的大小可以量化
请模仿一则VOA慢速新闻(点击此链接)的前三段,以正确的重音和语调朗读下面的段落。 A new study has found that ride-sharing services result in much more pollution than other kinds of private and public transportation. Ride-sharing trips also draw passengers away from more environment friendly methods of travel, like public transportation, walking or biking, the study found. Several studies in recent years have suggested that ride-sharing services like Uber and Lyft can worsen traffic problems in cities, which continue to have high rates of private vehicle ownership.
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