属于肠道正常菌群的细菌是（）。
A.铜绿假单胞菌
B.葡萄球菌
C.双歧杆菌
D.结核分枝杆菌
E.破伤风梭菌
参考答案：A, B, C, E
The trip from the school _____ about half an hour by coach. It was too _____. [ ]
A. spends, bored
B. takes, bored
C. spent, boring
D. took, boring
如动画所示，驾驶人的行为是正确的。
