A．certain dogs are helpful to police
B．it is always grateful to its master
C．it helps man in many ways
D．of what has been stated in both B and C
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更多“The dog has been an unselfish …”相关的问题
第1题
A.class Man extends Dog { }
B.class Man implements Dog { }
C.class Man { private BestFriend dog; }
D.class Man { private Dog bestFriend; }
E.class Man { private Dog<bestFriend>; }
F.class Man { private BestFriend<dog>; }
第2题
The dog has been of most value to man in the development of ______.
A．a treatment for rabies
B．open-heart surgery
C．a cure for distemper
D．Both A and C
第3题
The dog has been of most value to man m the development of ______.
A．a treatment for rabies
B．open-heart surgery
C．a cure for distemper
D．all of the above
第4题
The dog has been of most value to man in the development of ______.
A．a treatment for rabies
B．open-heart surgery
C．a cure for distemper
D．Both A and C
第5题
听力原文： The dog has often been an unselfish friend to man. It is always grateful to its master. It helps man in many ways. Certain breeds of dogs are used in criminal investigations. They are trained to sniff out drugs and bombs. They help police to catch criminals.
The clogs that help in criminal investigations are trained at a school called the Military Dog Studies Branch of the U.S. Air Force in Lackland, Texas. The dogs to be trained are selected by an air force team. This team visits large cities across the country to buy the dongs. They may buy dogs 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. The dogs chosen 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. The trainee dogs undergo the first stage of training when they arrive in Lackland. This is an 11-week course for patrol duty.. After this course, the best dogs are selected to go on 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 drag-sniffing dog is different from that given to a bomb-sniffing dog. A drug-sniffing dog is trained to scratch and dig for the drags when he sniffs them. A bomb-sniffing dog sits down when he finds a bomb. That is the alert for hidden explosives.
(33)
A．Given by the local government.
B．Born by a large number of bitches.
C．Bought from different cities and villages.
D．Captured over grassland.
第6题
听力原文： The dog has often been an unselfish friend to man. It is always grateful to its master. It helps man in many ways. Certain breeds of dogs are used in criminal investigations. They are mined to sniff out drags 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 U.S. Air Force in Lackland, Texas. The dogs to be trained are selected by an air force team. This team visits large cities across the country to buy the dogs. They may buy dogs 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. The dogs chosen 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. The trainee dogs undergo the first stage of training when they arrive in Lackland. This is an 11-week course for patrol duty. After this course, the best dogs are selected to go on 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 bomb-sniffing dog. A drug-sniffing dog is trained to scratch and dig for the drags when he sniffs them. A bomb-sniffing dog sits down when he finds a bomb. That is the alert for hidden explosives.
(23)
A．Given by the local government.
B．Born by a large number of bitches.
C．Bought from different cities and villages.
D．Captured over grassland.
第7题
A．She has been waiting for her friend's coming.
B．She has kept her friend's letter for six weeks.
C．She hasn't written to her friend for six weeks.
D．She owed her friend some money.
第9题
The loyalty of dogs to their masters has earned______"man's best friend".
A．the nickname of
B．them the nickname
C．a nickname
D．nicknames
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