I will tell you a secret, but you must promise it around.
A:not spread
B:not to spread
C:don't spread
D:to not spread
Yesterday we ______ camping in a forest and had great fun there.
【明确实验目的】实验室制取氧气
如图,在△ABC中,M、N是AB、BC的中点,AN、CM交于点O,那么△MON∽△AOC面积的比是____.