What are on show in the museum?一一Some photos（）by the children of Yushu,Qinghai.

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• What are on show in the museum?一一Some photos（）by the children of Yushu,Qinghai.Ahave been takenBwere takenCare takenDtaken公式
• What are on show in the museum?一一Some photos（）by the children of Yushu,Qinghai.Ahave been takenBwere takenCare takenDtaken
• A:What are on show in the museum?B:Some photos__by African children.A.are takenB.were taken C.takenD.have been taken并写出理由
• What are on show in the museum?一一Some photos（）by the children of Yushu,Qinghai.
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• 已知某种群中AA的基因频率为30% aa的基因频率为26% 如果该种群的个体自交 则f1基因型AA的频率为