It’s very brave ______ you ______ the boy out of the river.
A:for; to save
B:for; saving
C:of; saving
D:of; to save
南北半球中低纬度海区,大洋东岸的海水与大洋西岸的海水相比是( )
All people will ________sadness and happiness in life.
成语“凿壁偷光“是说( )的事。