扁桃体摘除术后用冷的机制是
A．减轻疼痛B．制止炎症扩散C．减轻局部充血、出血D．防止炎症部位化脓E．促进伤口愈合
参考答案：C
_____more countries can use natural energy in the future remains to be seen.
A．Whether
B．This
C．who
D．If
=______．
A．1998 B．11999 C．2000 D．2001
=______．