单选题
请根据下面短文回答第61-65题 It's 8:15 in the morning. They're having the first class. “May I come in, Mr. Black?” a girl says at the door. “Come in, please,” says Mr. Black.“You are five minutes late this morning, Lucy. It is the fourth time this week.” The girl often makes some excuses when she is late for class. Sometimes she says she doesn't feel well, or the bus is broken on the way, or her watch is slow...So her classmates are listening to her very carefully. “I'm sorry, Mr. Black,” says Lucy. “I'm late because the traffic is busy and I have to wait for the lights to turn green.” “But why don't you take an earlier bus?” “I just take the earlier bus. But it's no use. The later bus often overtakes the earlier one!” answers Lucy.