汉武帝时,对开通陆路“丝绸之路”功劳最大的是( )
A:张骞
B:班超
C:班固
D:卫青
无论a取什么实数,点P(a-1,2a2-4a+1)都在二次函数y上,Q(m,n)是二次函数y上的点,则4m2-2n+1=____.
Violence (暴力) computer games may have a bad ____________ on children.
填空。
sister 8 years old
She is my____ . She is ____ years old. She likes ____ in the water.
下列关于黄河的说法中,正确的是( )