I __ to go home now.[ ]
A. want
B. wants
C. to want
D. am wanting
答案：A
“政启开元，治宏贞观”所称赞的帝王是[ ]
A．唐高宗
B．唐太宗
C．武则天
D．唐玄宗
若xy=2，则（x+y）2﹣（x﹣y）2=( )
