Adding an additional lock will provide extra security when you are home. The deadlock, sometimes called an “exit only deadbolt” is a deadbolt that does not have an external (外部的) key. It is clearly visible on the door from the outside, ck itself. While this security won't help directly when you aren't home, the visibility may discourage an__intruder from trying the door.

　　Your door itself should be made of strong materials, such as one－inch thick solid hardwood or heavy metal.()15.The________． in the United States

　　D. how to run a home business

　　()16.Some home－based entrepreneurs do not invite clients to their home ________． others know about their business

　　D. in order to avoid being seen by burglars

　　()17.All the following are part of the writer's advice except that the homeowner ________．. fix an extra lock on the door from inside

　　C. have the doors made of solid hardwood or heavy metal

　　D. keep lights on in all rooms to threaten burglars

　　()18.What Someone who is invited for a visit.

　　B. Someone who illegally enters the home.

　　C. Someone who pays regular visits to the home.

　　D. Someone who tries to sell the lock.

　　三、根据短文内容从短文后的选项中选出 your arms or legs for some time, they become weak; when you start using again, they slowly become strong again. Everybody knows this, and nobody would think of questioning the fact. 19.______. When someone says that he has a good memory, he really means that he keeps his memory in practice by exercising it regularly, either consciously or unconsciously. When someone else says that his memory is poor, he really means that he does not give it enough opportunity to become strong. 20.______．One of them exercises his arms and legs by playing tennis, ______， many of us think that his parents are to blame, or that he is just unlucky, and few of us realize that it is just his own fault. Not all of us can become extremely strong or extremely clever; but all of us can, if we have ordinary bodies and brains, improve our strength and our memory by the same means—practice.

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