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請依下文回答第 41 題至第 45 題 　　All birds have voices. We think of them  41  singing, but many, such as birds of prey and ostriches, do not doso. In spite of this, they have a language that includes a variety of sounds, each  42  its own particular meaning. 　　The songs that we hear from songbirds in the spring are often complicated,  43  they are saying somethingsimple. Usually the singers are the males. They often sing at the edge of their territory. In this way, they attract matesand inform other males that this area  44  them. The songs are  45  ; however, they do save real fighting.
41
(A) as
(B) for
(C) like
(D) about

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