A:2
B:1
C:23
D:13
The woman is d____ the tea now.
影响沙漠中植物生活的最主要非生物因素是( )
已知函数f(x)=Acos(ωx+φ)的图象如图所示,f( π2 )=﹣ 23 ,则f(0)=( )