(

　　)36.The video cameras were used to catch the dogs' responses because ________.

　　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' habits

　　D．the dogs wagged their tails in different directions when they were in different moods

　　(

　　) 37.The underlined word “intensity” in Paragraph 3 means ________.

　　A.surprise

　　B．worry

　　C．excitement

　　D．interest

　　(

　　)38.When there are no stimuli, a dog will ________.

　　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

　　(

　　)39. The underlined word “they” in the last sentence refers to ________.

　　A．the dogs

　　B．the trainers

　　C．the systems

　　D．the researchers

　　(

　　)40.The purpose of doing the experiment is ________.

　　A．to train dogs for their owners

　　B．to help people judge the mood of dogs

　　C．to help dogs find company

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