下列哪些符合破伤风梭菌的特征（）
A.兼性厌氧
B.能形成芽胞
C.主要通过外伤感染
D.由外毒素致病
E.常引起败血症致死
参考答案：B, C, D
After ________ half a kilometer, I ________ feel tired. [ ]
A. run, begin to
B. running, began to
C. to run, began to
D. running, begin with
勘探方法
