《吕氏春秋·察今》记载：荆人欲袭宋，使人先表流水。流水暴益，荆人弗知。循表而夜涉，溺死者千有余人，军惊而坏都舍。以下选项，与荆人教训具有相同哲学寓意的是（ ）
A：士以进死为荣，退生为辱
B：国虽大，好战必亡；天下虽安，忘战必危
C：九河盈溢，非一块所防；带甲百万，非一勇所抗
D：兵无常势，水无常形；能因敌变化而取胜者，谓之神
Mike is a middle school student. He goes to school from Monday to Friday. His home is about 5 miles from school. He usually walks to school. It takes him 30 minutes to walk there. Nancy's home is a little farther. It's 20 miles from school. So she often takes the school bus. It takes her 15 minutes to get to school. Bob lives outside the city. It's a town 30 miles away from his school. He takes the subway. It takes him 8 minutes to get to school by subway. He can have breakfast at home and then leave for the subway station. He studies very hard.
