问题
选择题
基因突变、基因重组和染色体变异的共同点是都能[ ]
A．产生新的基因
B．产生可遗传的变异
C．产生新的基因型
D．改变基因中的遗传信息
答案
答案：B
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基因突变、基因重组和染色体变异的共同点是都能[ ]
A．产生新的基因
B．产生可遗传的变异
C．产生新的基因型
D．改变基因中的遗传信息
答案：B
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2.The Smiths have an nine-year-old girl who _____ dance. She has won two national prizes up to now. 3. Its purpose was to help the whole society _____ helpinventors. 4. The family went to Britain and _____ there. 5. The task is so easy to do that I can finish it _____ tenminutes. 6. He worked hard so that he _____ pass the exam. 7. The house was _____ by high walls and trees. 8. It is good for you to _____ your friends sometimes. |