多发性硬化脑脊液IgG壳内合成检测指数应高于（）
A.0.7
B.0.6
C.0.3
D.0.4
E.0.5
参考答案：A
The cigarette end thrown away by a careless farmer _____ the big forest and brought us great loss. [ ]
A. brought in
B. resulted from
C. led to
D. led out
