题目

Read the passage and choose the best answers. （根据短文内容，选择最佳答案。）Washingthe ApplesMrs.Smith has a shop in the town. There are all kinds of fruit in her shop. She'sfriendly to the customers and never fools① anyone. So the customers like to buy fruitin her shop, and she gets more and more money. Oneday, the apples she sold were all fresh and nice. She remembered her son Steveliked them best, so she brought some home for her son. After lunch, she wentout and left the apples on the table. That afternoon Steve came back fromschool, he felt very hungry. He looked for s 关于下列叙述中，不能引起可遗传变异的是 [　　] A．控制不同性状的基因重组引起的变异 B．染色体数目发生改变引起的变异 C．控制性状的基因发生突变引起的变异 D．由环境条件引起的变异