Fred ________ many football boots. But this pair of boots ________ the nicest.
A:has, are
B:has, is
C:there are, are
D:there are, is
以下关于实验的描述,正确的是( )
下列字形和划线字的注音完全正确的一项是 ( )
关于黄土高原的叙述,不正确的是( )