— We did it by .
A:myself
B:yourself
C:ourselves
D:themselves
连词成句。
-- Mum, I have nothing to do in my free time but do homework.
-- My dear, you should ___ a hobby like drawing or taking photos.
如图,电灯P在横杆AB的正上方,AB在灯光下的影子为CD,AB∥CD,AB=2m,CD=5m,点P到CD的距离是3m,则点P到AB的距离是( )
图为北半球某河流两岸八地中,在自然状态下侵蚀较重的是( )