我国十六世纪以前医药成就的大总结是（）
参考答案：本草纲目
The Green family ________ China for five years.
A. has come to B. has been in C. has been to
可用于牙弓非缺隙侧的卡环是（）。
A．杆形卡环
B．回力卡环
C．.联合卡环
D．对半卡环
E．圈形卡环
