旅游安全管理工作贯彻“ __________”的方针。
参考答案:安全第一,预防为主
—Let me help you carry those books.
—____________. [ ]
A. That's very kind of you
B. No,I can
C. No ,you can't
D. Yes , please
东晋玄言诗的代表人物有孙绰和()。