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单选题

A．Given by the local government．
B．Born by a large number of bitches．
C．Bought from different cities．
D．Captured over grassland．

参考答案C
解析: Dogs help man in many ways.Some dogs are trained to lead blind people.Certain breeds of dogs are use din criminal investigations.They are trained to sniff out drugs and bombs.They help police to catch criminals.The dogs that help in criminal investigations are trained at a school called the Military Dog Studies branch of the US Air Force, in Lackl and, Texas.The dogs to be trained are selected by an air force team.In order to have better choice, the variety of breeds is very important.(20) This team visits large cities across the country to buy dogs.They may buy from private citizens for up to $ 750 each.Some citizens freely give their dogs.The dogs selected must be healthy, brave and aggressive.They must be able to fight back if they are attacked and they are between the ages of one and three.They are given a medical examination when they arrive at the school.
Their physical examination includes X-rays and heart tests.( 21 ) The dogs undergo the first stage of training when they arrive in Lack land .This is an ll-week course for patrol duty.After this course, the best dogs are selected to go on (22) another 9-week course.They learn drug sniffing or bomb-sniffing:.After this course, the dogs are ready for their jobs in the cities or on air force bases.
The training given to a drug-sniffing dog is different from that given to a bombs~Tmg dog.A drug-sniffing dog is trained to scratch and dig for the drugs when he sniffs them.A bomb-sniffing dog sits down when he finds a bomb.That is the alert for hidden explosives.
How are the dogs obtained for training?
C.【精解】根据定位句可知，用来训练的狗是由一支专门的空军部队从全国各地买来的，故答案为C.
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单选题

A．ll-week course for control duty．
B．ll-week course for patrol duty．
C．9-week course for control duty．
D．9-week course for patrol duty．

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单选题

A．Catching runaway criminals．
B．Scratching the hidden bombs．
C．Patrolling the dangerous town．
D．Drug-sniffing or bomb-sniffing．

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单选题

A．Because without air the plane can't fly．
B．Because the plane needs air for its refueling．
C．Because the passengers' lives depend on air．
D．Because the passengers have paid for it．

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