——Your father never gets up late, does he?——______. It's unusual for him to be late for work this morning.
A:No, he does
B:Yes, he doesn't
C:No, he doesn't
D:Yes, he does
通过精确测量发现,地球是一个( )
下列动物细胞中,染色体数目、种类与受精卵相同的是( )。
生物与环境密切相关,下列说法不正确的是( )
已知函数f(x)=fx=x2+1,x>0cosx,x≤0,则下列结论正确的是( )