Introduction

　　A lot of crime is against bicycles. About 150,000 bicycles are stolen every year and most are never found. You can prevent this happening by following a few careful steps.

　　Basic Security

　　Do not leave your bicycle in out-of-the-way places. Always lock your bicycle when you leave. Secure it to lampposts or trees. Take off smaller parts and take them with you, for example lights and saddles(车座).

　　Locks

　　Get a good lock. There are many different types in the shops. Buy one that has been tested against attack. Ask for a recommendation from a bike shop.

　　Marking

　　Security marking your bike can act as a deterrent to a thief. It can also help the police find your bicycle. It should be clearly written and include your postcode and your house or flat number. This will provide a simple way to identify your bicycle.

　　Registration

　　There are a number of companies who will security mark your bicycle for you. They will then put your registration number and personal details on their computer database. Then if your bicycle is found it will be easy to contact you.

　　Finally

　　Keep a record of the bicycle yourself: its make, model and registration number. You can even take photograph of it. This will prove the bicycle belongs to you. 　　56．Which part of the text gives you information on how to lock up your bicycle when you leave it?

　　 A．Locks. B．Marking. C．Registration. D．Basic Security.

　　57．The underlined phrase "act as a deterrent to a thief" means ________.

　　 A．help you recognize your bike B．help the police find your bicycle

C．stop someone stealing your bicycle D．stop you worrying about your bike