药物代谢的主要器官是
A．肾脏
B．肝脏
C．胆汁
D．皮肤
E．脑
参考答案：B
.
Written English is more or less the same in both British and American English _______ the differences in spelling.
A．except for
B．except that
C．except
D．besides
形成几何学模糊的根本原因是
A．焦-片距B．焦-肢距C．肢-片距D．焦点面积E．用遮线器
