D. Give him advice only when necessary.

　　C

　　We were ordinary people taking the bus every day that summer. During the early morning rides，we sat sleepily on our seats. One of the passengers was a small grey man to the center for senior citizens. He walked with a stoop(驼背)and a sad look on his face. We paid little attention to him.

　　Then one July morning he said good morning to the driver and smiled to us before sitting down. The driver nodded politely，the rest of us being silent. The next day，the old man boarded the bus energetically，smiled and said loud，"Good morning！"Some of us looked up，amazed，and murmured"Good morning"．The following weeks we were more surprised. Our friend was dressed in a nice old suit with the thin hair carefully combed. He said good morning to us every day and we gradually began to nod and talk to each other. One morning he had a bunch of wild flowers in his hand. The driver smilingly asked，"Have you got yourself a girlfriend？"He nodded shyly，"She lives at the center."The other passengers whistled and clapped at him. Charlie bowed before sitting down.

　　Every morning after that Charlie always brought a flower. Some regular passengers began bringing him flowers for his bunch. Everyone smiled and joked about it.

　　But one morning he didn't turn up. When he wasn't there the following days，we started wondering if he was sick or...We stopped at the center for senior citizens. The staff told us he was fine，but he hadn't been coming that week. One of his very close friends had died at the weekend. They expected him back on Monday. How silent we were on the rest of the way to work!

　　The next Monday he was waiting at the stop，stooping a bit more and a bit more grey. Inside the bus was a silence，all of us sitting with our eyes filled with tears and wild flowers in our hands.

　　28．The old man boarded the bus energetically probably because ________．

　　A．he bought a bunch of flowers B．he got to know other passengers

　　C．he had a sweet dream D．he fell in love with a lady

　　29．What change did the old man bring to the early morning bus?

　　A．The bus was full of life. B．The passengers were silent.

　　C．The passengers were sleepy. D．The bus was punctual.

　　30．Why didn't the old man turn up for several days?

　　A．He wondered whether others cared about him.[来源:学科网]

　　B．He was in sorrow for the loss of his friend.

　　C．He had a quarrel with the staff of the center.

D．He wasn't himself for the cold weather.