下列物质能使蛋白质失去生理功能的有 [ ]
A.浓硝酸
B.水
C.溶液
D.
AC
请以“假如没有了摩擦”为题，写出两个有关的场景．
场景1：
场景2：
Another important factor ______ in choosing the place is the availability of coal in ample quantities.
A．for considering
B．to be considered
C．for being considered
D．to consider
溶液 
溶液