夏科（Charcot）三联症出现于（）。
A.急性胰腺炎
B.胆石继发胆管炎
C.急性梗阻性化脓性胆管炎
D.急性胃炎
E.急性胆囊炎
参考答案：B
设函数f(x)=(x2-6x+c1)(x2-6x+c2)(x2-6x+c3)，集合M={x|f（x）=0}={x1，x2，x3，x4，x5}⊆N*，设c1≥c2≥c3，则c1-c3=（ ）
A．6
B．8
C．2
D．4
The thought of going back home was _______ kept him happy while he was working abroad.
A．that
B．all that
C．all what
D．which
