People in Fresno, California already have a free bicycle program . In fact , this idea began in Amsterdam over 40years ago . These programs encourage citizens to get out of their cars and onto pollution-free bikes .

Fresno's Yellow Bike Program puts about forty bicycles around the city . The bikes are painted bright yellow so people know they can take them . When people take a yellow bike , they can ride to work or to shopping areas ,and then leave the bike for the next rider .

Some people worry that the free bikes will be stolen . However , theft hasn't been a problem in free-bike cities by now.

While most people think the bike program is a good idea , only a few say they will use it . "I will still drive my car," says Joanna Greene . "San Francisco has a lot of hills . My office is at the top of Potrero Hill . I don't think I'm in good shape . And , wouldn't I have to carry a helmet with me all the time ?"

Phil Chung agrees , " There is too much traffic . Riding a bicycle can be risky . There are not very many bike lanes." He continues , "Plus , it's too cold in the winter . And what if you ride a bike to work , and then there isn't one to ride home ?"

Program leaders know there will be problems . But they think it's worth trying . "It's not the solution for everyone," states Sylvia Pass . "But if just one hundred people use it every day , that's one hundred cars that aren't on the streets , one hundred parking spaces that aren't used . I think it's a great beginning ."

25．San Francisco provides bicycles to the public because .

　A．there are many bikes available

　B．many people don't have cars of their own

　C．many other cities have already done so

　D．the traffic problems are terrible

26．The following statements are the disadvantages of free bike program in Sam Francisco except that .

　A．free bikes will be stolen

　B．San Francisco is not flat at all

C．riding a bike is not safe enough