12.C精子形成过程中,X染色体和Y染色体在减数第一次分裂后期分离,次级精母细胞可能不含Y染色体A倩误:在卵细胞形成过程中,初级卵母细胞和次级卵母细胞的细胞质分裂都不是均等的,因此每个卵细胞继承了初级卵母细胞大部分的细胞质,B错误:正常情况下受精卵中来自父母双方的染色体各占一半,C正确;正常情况下受精卵中的核基因父母双方一样多,但质基因主要由母方提供,D错误

One possible versionSeveral minutes later, the ice broke suddenly and Harry's feet sank into the water. It was noep, but his legs got wet to the knees. Harry was so upset that the accident would delay hisschedule. He had to find some firewood to build a fire to dry his clothes. He pulled off his glovestook out his matches, and lighted the fire. Seeing the burning fire, he had thought he was safe. Butsuddenly, without warming, a heavy mass of snow dropped down. The flame of hope was put outUnluckily, his dog ran away and the fear of death came over Harry. He had no choice but torun to save himself. However, he did not feel his feet when they hit the ground. Having falleneveral times, he decided to rest a while. As he lay in the snow, he noticed he was not shaking. Hecould not feel his nose or fingers or feet. A feeling of horror came into his mind. It was when herealized he was going to die that he heard a bark and the noise his friends made

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