—I went to Hong Kong and _______ an international meeting for a week.
A:took part in
B:attended
C:joined
一物体沿固定的粗糙斜面匀速下滑,物体在下滑的过程中 ( )
①交通压力将有所减轻
②政治中心地位将大幅度降低
③城市空气质量将进一步提高
④住房紧张状况将有所缓解