--Can you tell me____________?

---- You can take No.16 bus.

A．how can we get to the Olympic Park

B．how we can get to the Olympic Park

C．how did we get to the Olympic Park

D．how we got to the Olympic Park

某学者在某地进行吸烟与肺癌关系的研究，结果显示，该地人群肺癌年死亡率为0.56‰，吸烟与不吸烟者的肺癌年死亡率为0.96‰和0.07‰

上述研究的特异危险度为

A．0.40‰
B．0.89‰
C．92.7%
D．87.5%
E．0.49‰