— It seems that Mr. Wu is standing there.— It ______ be him because he called me from Canada just now.
A:mustn't
B:can't
C:needn't
D:shouldn't
一位父亲与他5岁的儿子磊磊一起上楼回家,对此,下列说法中错误的是 ()
如图,正比例函数y=mx与反比例函数y=nx(m、n是非零常数)的图象交于A、B两点.若点A的坐标为(1,2),则点B的坐标是( )
要得到函数y=sin2x-π6的图象,只需将函数y=sin2x的图象( )
下列有关我国人口的叙述,正确的是( )