—___these her erasers?
—No, they ___.
A:Is, isn't
B:Are, aren't
C:Are, is
D:Is, are
____,池鱼思故渊。 (陶渊明《归园田居》)
图为某生物体内生物一项生命活动的过程示意图,下列有关说法正确的是( )