黄疸出血型钩体病引起死亡的主要原因是（）
A.急性肝衰竭
B.急性肾衰竭
C.消化道大出血
D.肺大出血
E.中枢型呼吸衰竭
参考答案：B
I was really anxious about you.You _____ home without a word. [ ]
A. mustn't leave
B. shouldn't have left
C. couldn't have left
D. needn't leave
低聚糖也是一种低能量糖，大豆低聚糖的热值仅为水苏糖的50%，可添加在糖尿病患者的专用食品中。( )
