用基因工程技术构建抗除草剂的转基因烟草,下列有关说法错误的是( )
A:用限制性核酸内切酶切割含目的基因的DNA分子.
B:用DNA聚合酶连接经切割的抗除草剂基因和载体
C:转入的抗除草剂基因可通过花粉传入环境中.
D:用含除草剂的培养基筛选转基因烟草细胞
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A. The boy is going to the park.
B. Some newspapers are flying away.
C. The balloons are flying away.
D. These boys are playing football.
E. They are going to go to the park tomorrow.
新中国成立后,开展的土地改革运动胜利完成的时间是____。