Passage Two
Can animals be made to work for us Some scientists think that one day animals may be trained to do a number of simple jobs that are now done by human beings.
They point out that at a circus, for example, we may see elephants, monkeys, dogs and other animals doing quite skillful things. Perhaps you have seen them on the television or in a film. If you watch closely, you may notice that the trainer always gives the animal a piece of candy or a piece of fruit as a reward. The scientists say that many different animals may be trained to do a number of simple jobs if they know they will get a reward for doing them.
Of course, as we know, dogs can be used to guard a house, and soldiers in both old and modem times have used geese to give warning by making a lot of noise when a stranger or an enemy comes near. But it may be possible to train animals to work in factories. In Russia, for example, pigeons which are birds with good eyesight, are bei
A. Scientists consider apes may drive trains some day.
B. Apes have worked in some factories.
C. Apes may one day be used to gather crops.
D. An ape is not a large monkey.
Passage Two
Can animals be made to work for us Some scientists think that one day animals may be trained to do a number of simple jobs that are now done by human beings.
They point out that at a circus, for example, we may see elephants, monkeys, dogs and other animals doing quite skillful things. Perhaps you have seen them on the television or in a film. If you watch closely, you may notice that the trainer always gives the animal a piece of candy or a piece of fruit as a reward. The scientists say that many different animals may be trained to do a number of simple jobs if they know they will get a reward for doing them.
Of course, as we know, dogs can be used to guard a house, and soldiers in both old and modem times have used geese to give warning by making a lot of noise when a stranger or an enemy comes near. But it may be possible to train animals to work in factories. In Russia, for example, pigeons which are birds with good eyesight, are bei
A. Animals are very skillful at a circus.
B. They are big and strong.
C. Some animals are as clever as human beings.
D. Animals can be trained because they like to get something as a rewar
Passage One
Many animals have an excellent sense of smell, which they use in hunting. On the other hand, their eyesight may be poor. Dogs, for example, have poor eyesight and no color vision. They see only shades of gray. But the dog’s sense of smell is extraordinary,
The kind of dog known as Alsatian has 220 million olfactory (嗅觉) cells. Man has five million. Scientists believe that the Alsatian is one million times better than man in finding out odors.
The human sense of smell, however, is really quite good. The average human being can distinguish more than 10 000 different odors.
Passage Five
Many animals are used to help scientists find cures for diseases. One of the most common animals used is monkeys, or primates. There are groups of people who want to stop the research on animals. They are called animal rights activists.
The scientists say their research could help save the lives of many men, women and children. They try to cure diseases like cancer and AIDS.
The animal rights activists say the animals suffer. They take baby monkeys away from their mothers, and sometimes holes are drilled in their heads. The activists have tried to stop the research for the past 10 years. They let animals go free or damage the labs.
The University of California at Davis has 3,800 rhesus macaque monkeys. It is one of the largest primate research labs. The activists sent letters to researchers at Davis and about eighty other researchers around the country, whose names were on the web pages. The warning letters had razor blades hidd
A. to see the animals
B. to protect animal's rights
C. to stop scientific research
D. to fight with police
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