A:many of his song
B:many of whose song
C:many of which song
D:and many of whose song
在家中,父母与我们之间容易产生代沟,对此正确的做法是( )
将二次函数y=x2的图象先向下平移1个单位,再向右平移3个单位,得到的图象与一次函数y=2x+b的图象有公共点,则实数b的取值范围是( )