There are forty-eight students in our class. There are twenty-three boys and twenty-five girls. Some students live near the school, and some others live very far from the school. About half of the students come to school by bike. They often get to school at a quarter to seven. About ten students often come to school by bus. They often go to school very early, too. Another ten students come to school on foot. Their homes are near the school, but they are often late for school, because they get up very late.

《晋书》记载：曹魏咸熙二年（256年），“令诸郡中正以六条举淹滞：一曰忠恪匪躬，二曰孝敬尽礼，三曰友于兄弟，四曰沽身劳谦，五曰信义可复，六曰学以为己”。由此可知（    ）