A:they
B:their
C:them
D:themselves
设函数f(x)=log3x+2x-a在区间(1,2)内有零点,则实数a的取值范围是( )
读地球“公转示意图”,回答:
His parents ________ music and art. ( )
X
0
1
2
3
y
5
7