— It's dangerous to swim here. Look at the sign.
— Oh, I notice it. Thanks for telling me.
A:haven't
B:won't
C:don't
D:didn't
⊙O1、⊙O2、⊙O3两两外切,且半径分别为2cm、3cm、10cm,则△O1O2O3 的形状是( )
下面划线字注音有误的一项是( )。
对下列诗歌理解不正确的一项是( )