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【判断题】
交配器官又名器,公鸡的交配器官不发达 ,无真正的阴茎,但有一整套完整的交配器,,位于泄殖腔后端。鸭,鹅的交配器官较发达,平时套索在泄殖腔内,呈囊状。
A.
正确
B.
错误
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【单选题】Passage Two The era of the cowboy really began after the Civil War. During this decisive war the Texas cattle had roamed undisturbed in the wild, breeding freely on the plains and greatl...
A.
They have easier life in winter than in spring.
B.
They use a rope to handle the horse.
C.
They spend most of their daily time on the horse.
D.
Most of them know more than three languages.
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【单选题】Passage Two The era of the cowboy really began after the Civil War. During this decisive war the Texas cattle had roamed undisturbed in the wild, breeding freely on the plains and greatl...
A.
They have easier life in winter than in spring.
B.
They use a rope to handle the horse.
C.
They spend most of their daily time on the horse.
D.
Most of them know more than three languages.
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