11.阅读下面的短文, 从短文后每小题所给的A、B、C、D四个选项中, 选出可以填入空白处的最佳选项, 使短文意思完整.
In the USA, taking the school bus is a popular way for children to get to school. There are about 480,000 (1) school buses in the country. In 1939, yellow became (成为) the color of school buses (2) the color helped warn (警告) (3) cars. A yellow bus and black letters on it are easy to (4) in the early morning.
On the school bus, (5) can listen to music, talk (6) the phone or just sleep. But they (7) put things in the aisle (过道). They should keep their hands and arms (8) the bus. It is not a good idea to (9) to the bus driver, because he/she can't drive (10) when he/she is talking.
These days, school buses are more popular (受欢迎的) in China, too. Wang Li, a student from Beijing Chaoyang Middle School, (11) a school bus to school since (自从) September. It (12) her about 40 minutes to get to school every morning. "It's a lot more interesting than taking the subway, because you sit with your classmates. (13) it saves (节省) a lot of time. So we all (14) the school bus,"the (15) girl said.