最早提出用大剂红花、桃仁、降香及失笑散治疗死血心痛的医家是（）
A.孙思邈
B.危亦林
C.朱丹溪
D.王肯堂
E.林佩琴
参考答案：B
Some of the students have already learned enough English to _____
a conversation with an English speaker.
A．go on
B．carry on
C．keep on
D．hold on
什么是全面最大负担原则？
