Passage 1 Billy is 14 years old and in the ninth grade. He has a part-time job which gets him up every morning at 5 o.clock. He is a newspaper boy. Each morning，Billy leaves the house at 5:15 to go to the corner，where the newspapers are. The newspapers are delivered to the corner by truck at midnight. He always takes a wagon to carry them. In the winter, it is still dark when he gets up，but during the rest of the year it is light. Billy must deliver the newspapers to the houses of people on his route in all kinds of weather. He tries to put each paper on the porch(门廊)where it will be protected from wind and rain or snow. His customers think he does a good job. Sometimes they give him tips(小费). Billy earns about $ 70 per month，and he is saving some of the money to go to college. He spends the rest on records and clothes. Once a month，he has to collect money from his customers. Since many of them work during the day，Billy has to collect the money at night. Sometimes，when Billy is sick，his brother has to deliver the newspapers. Once，Billy.s father had to help. Billy has seventy customers now，but he hopes to get more soon. Someday，if he gets more customers，Billy might win a prize for being an outstanding(突出的)newspaper boy. He wants to win a trip to Europe，but he will be happy if he wins a new bicycle.

31. Keeping a part-time job tells us that Billy ______. [

A、 ] has to make a living by himself [

B、 ] can not get any support from his family [

C、 ] is independent and self-confident

D、 ] has to pay for his school tuition [

---