一Why are you so tired these days?
一Well,I have work to do.
A:too much
B:too many
C:much too
D:many too
下列关于氧气的说法中,不正确的是( )
李华同学平时不爱吃水果和蔬菜,结果导致他的牙龈经常出血,原因是他体内缺乏( )