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Why do animals of different species communicate with one another？
A.Because they like to set up their own communication systems．
B.Because they want to take advantage of the other species．
C.Because they tend to keep more food to themselves．
D.Because they benefit from using the information from other species．
答案
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第1题
A.Papers focusing on the treatment of hearing loss
B.How to make appointments with the doctors
C.The reasons why animals also suffer from hearing loss
D.hemical substances which can lead to hearing loss
E.我不确定
第6题
Some warm-blooded animals ______ hibernate.
A. need not
B. does not need
C. not need
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第8题
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A.lies in
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第9题
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C.How many books do you have
