将二次函数y=(x-2)2的图象向上平移两个单位,得到的新的图象的表达式是[ ]
A.y=x2+2
B.y=(x-2)2+2
C.y=(x+2)2+2
D.y=2(x-2)2
答案:B
We can hear sound because our earth is surrounded by thick air _____ sound can travel.[ ]
A. in that
B. by which
C. with which
D. through which
石淋实证的主方是( )
A.石苇散B.八正散C.无比山药丸D.沉香散