施工方案由施工单位制定，经相关设备管理单位会签后，上报铁路局主管业务处，其中，建设项

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 1.4 billion bicycles and only 400 million 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 neighbourhooD. You may discover something new all around you. Stopping and getting off a bike is easier than stopping and getting out of your car. You can bike to work and benefit (受益) from the enjoyable exercise without polluting the environment. You don’t even have to ride all the way.

Folding (折叠) 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 in a suitcase. 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 travelers.

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 (心情).

·Exercise like bicycling has been shown to make people feel better, more relaxed and self-confident.

·Bicycling is healthier than driving.

When you are riding your bicycle around your neighbourhood, you may （）.

A. pollute the environment around

B. find something you didn’t notice

C. go everywhere and use a little oil

D. get off your bike and begin to work

我国的会计核算软件主要为了进行测试。( )

下列哪一组中的构造都属于岩浆岩的构造类型？（）

A.流纹状、块状、气孔状、杏仁状

B.流纹状、碎屑状、气孔状、杏仁状

C.气孔状、砾状、杏仁状、流纹状

D.杏仁状、板状、流纹状、块状

因主动脉瓣、肺动脉瓣关闭时的震动而致( )

A．第一心音
B．第二心音
C．第三心音
D．第四心音
E．心包拍击音