Whipple三联征是：（），（），（）。
参考答案：阵发性低血糖；发作时血糖低于2．8mmol／L；口服或静脉给葡萄糖后缓解
This is the most interesting book _____I have ever read.
A．which
B．that
C．/
D．B and C
— How ____ the people in Yunnan?
— Very friendly. [ ]
A. were
B. was
C. is
D. do
