—I miss my mother very much. She has gone abroad on business for nearly a year but luckily she will be back in a week.

—Pardon? I ______ something else just now. ________ will she come back?

A．was thinking; How long

B．thought; How often

C．was thinking; How soon

D．thought; When

在倾角为θ=37°固定的足够长的光滑斜面上，有一质量为m=2kg的滑块，静止释放的同时，并对滑块施加一个垂直斜面向上的力F，力F的大小与滑块速度大小的关系满足：F=kv，其中：k=2N•s/m，试求滑块在斜面上滑行的最大距离．（sin37°=0.6，cos37°=0.8，g=10m/s²）