题目内容：

Suppose you find a bright yellow bike on a street corner in the city. You hop on(跨上)it and 31  . But wait—isn’t this stealing? No, it isn’t.   32  shouts,“Stop! Thief!”  That is   33  this free ride is just fine with the city.

You   34  find hundreds of free yellow bikes in some US cities. The idea began in Portland, Oregon, in 1994. People saw a need for 35  transportation, and they wanted to help 36 

pollution. So, to get citizens(市民)   37  their cars and onto pollution-free bikes, they   38  the Yellow Bike Project.

The   39  bikes are painted bright yellow and placed throughout the city. People can hop on the yellow bike and ride to run errands(短程差事), to work   40  to school. Then, they leave the bike for the   41  rider. There have been times when bikes have been stolen, but most people   42  the rules, because they think it is not wise to   43  the bike that’s already free.

Portland’s   44  was quickly loved by a lot of people. Within two years of its starts, similar programs were   45   in cities in six other states.

1. A. drive away     B. ride away     C. ride back     D. run away

2.A. No one        B. Someone     C. Anyone      D. Everyone

3.A. whether        B. so           C. because      D. though

4.A. have to         B. don’t have to   C. can’t       D. can

5. A. expensive       B. crowded      C. free      D. common

6.A. protect         B. control        C. make      D. bring

7.A. out of          B. into          C. up         D. near

8.A. ended          B. started       C. changed      D. refused

9.A. public          B. private       C. clean       D. dirty

10.A. but            B. as           C. until          D. or

11.A. next           B. last          C. best          D. first

12.A. break          B. make          C. discuss      D. follow

13.A. buy            B. repair         C. produce      D. steal

14. A. citizen          B. street         C. idea           D. school

15.A. looked up        B. made up      C. put up         D. set up