题目

Canada Geese( 鹅) are large blue and white birds. When autumn comes, they have to go to the south where the weather is warmer. The winters are so cold in Canada that the birds will die if they stay there.     Last spring, Bill Lishman found sixteen young Canada Geese on his farm. They had lost their parents. Bill thought, These young birds won't know what to do in the autumn. He had a small plane and he decided to teach the birds to follow him. All through the summer, he went on short trips in his plane and the young geese were after him.When the cold weather arrived in the autumn,下列关于生物学研究方法的描述，不正确的是（   ）A．利用不同色素在层析液中的溶解度不同因而扩散速度不同，可以分离叶绿体中的色素B．在光学显微镜下可观察到细胞膜，但要观察磷脂双分子层则需使用电子显微镜C．生殖细胞和体细胞融合获得的白菜甘蓝杂种植株，分别为二倍体和四倍体，均可育D．证明光合作用中释放的氧气来自水、分泌蛋白形成所参与的细胞结构则采用的技术手段相似