一名酒水服务员可负责（）名客人。
A.15-20
B.25-30
C.35-40
D.40-45
参考答案：D
What ______ the doctors most was that they could not find the cause of the disease.
A．astonished
B．puzzled
C．surprised
D．amused
园艺植物花芽的类型分为（）和（）
