单项选择。
People travel by plane years ago.[ ]
A. don't
B. doesn't
C. didn't
答案：C
试述内部招募的优缺点。
桂枝汤证汗出的病机是（）
A.里热炽盛，迫津外越
B.营卫失和，卫不固营
C.肠胃实热，迫津外越
D.阳气虚衰，卫阳不固
E.热郁于里，郁热上蒸
