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A.it was easier to catch the dogs’ response changes in the tail wagging |
B.the dogs were put in the wooden boxes and tested one at a time |
C.they enabled the dogs’ owners to know about their dogs’ habit |
D.the dogs wagged their tails in different directions when they were in different moods |
A.surprise | B.worry |
C.excitement | D.interest |
A.wag to the left | B.wag to the right |
C.not wag at all | D.wag to the left and then to the right |
A.the dogs | B.the trainers |
C.the systems | D.the researchers |
A.to train dogs for their owners |
B.to help people judge the mood of dogs |
C.to help dogs find company |
D.to help people choose their pet dogs |
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A.a(chǎn) long time ago, man didn't know how to make use of wood |
B.trees are not as useful as they were in the past |
C.trees were more found in the past than they are today |
D.people have always found trees useful |
A.the land would become better | B.heavy rains would be very clean |
C.the rich soil couldn't be kept | D.there wouldn't be any plants |
A.do nothing to keep the balance(平衡)of nature |
B.take his best to keep the balance of nature |
C.try his best to keep the balance of nature |
D.do his best to stop the balance of nature |
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