蛋白质变性不断裂的键是（）。
A.氢键
B.肽键
C.疏水键
D.盐键
E.二硫键
参考答案：B
The hunter insisted that he _____ a tiger and that a searching team ______ to hunt for it. [ ]
A. has seen; be set up
B. had seen; be set up
C. saw; would be set up
D. should see; should be set up
