细菌的测量单位是：（）
A.μm
B.nm
C.mm
D.cm
参考答案：A
新星小学去旅游，用4辆同样的客车每次可以运送224名学生，用13辆这样的客车，每次可以运送多少名学生？
Believe in yourself. You're better than _________. You are sure to succeed. [ ]
A. someone else
B. anyone else
C. everyone else
D. no one else
