12．
More and more people like bicycling and it is no surprise．It is fun，healthy and good for the environment．Maybe that's why there are 1.4billion bicycles and only 400million cars on roads worldwide today．Bikes can take you almost anywhere，and there is no oil cost!
Get on a bicycle and ride around your countryside．You may discover something new that you didn't notice all around you．Stopping and getting off a bike is easier than stopping and getting out of your car．You can ride a bike to work and enjoy exercising at the same time without polluting the environment．You don't even have to ride all the way．
Folding （折疊） bikes work well for people who ride the train．Just fold the bike and take it with you．You can do the same on an airplane．A folding bike can be packed into a bag or a small box．You can also take a common bike with you when you fly．But be sure to look for information by getting on airline websites．Not all airlines are bicycle-friendly to travellers．
Health benefits of bicycling：
It helps to prevent heart diseases．
Bicycling helps to control your weight．A 15-minute
bike ride to and from work three times a week
burns off five kilos of fat in a year．
Bicycling can improve your mood．Exercise like
bicycling has been shown to make people feel better，more relaxed and self-confident．Bicycling is healthier than driving．
38．From the passage，we know that bicycling is becoming veryC．
A．surprising
B．exciting
C．popular
D．expensive
39．When you are riding your bicycle around your countryside，you mayD．
A．pollute the environment around
B．go everywhere and use a little oil
C．get off your bike and begin to work
D．discover something new that you didn't notice
40．One of the health benefits from bicycling is thatB．
A．you can fold the bicycle
B．you will be more relaxed
C．you may get fatter and fatter
D．you will be friendly to others
41．From the passage，we can learn thatD．
A．riding bikes is not safer than driving cars
B．we can't discover anything new at all by driving cars
C．bicycling is enjoyable exercise just for the young
D．bicycling is a kind of low-carbon（低碳） life style．
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