In the last six to nine months，teens in the US        to text messaging in numbers twice that in Europe and Asia．

A．took

B．have taken

C．had taken

D．would take

当自动站风的观测记录（2分钟或10分钟平均）缺测，用其它测风仪器观测记录代替时，风向照记（不须将其方位转换为该方位的中心角度）；当风速≤0.2m/s时，风向记“C”，风速记“0.0”。（）