第四部分写作第一节Last week our school held the Sports Week. We hade: lots of activities, such as running, hiking, and many kindsof ball games. We even had an exciting two-day sportsmeeting.Nowadays students are busy with their studies anddont get much exercise. This really worries our schoolauthority. So our school started the Sports WeekThe Sports Week proves to be a great success. It notonly builds up our bodies, but trains our characters aswell. Without health, there is no real happiness in life. Weshould work out regularly to keep fit.

适宜的温度和pH,充足7.B解析:利用果树的芽变培育新品种主要是利用芽细胞发生的基因突变,A正确;若有丝分裂过程中染色体片段的互换发生在同源染色体的非姐妹染色单体之间,也会造成子细胞基因型的改变如基因型为ABb的细胞发生该变异后可产生AABb和aBb的两个子细胞,B错误;某种作物体组胞内增加一条或整组染色体,这是利用了染色体数目变异的原理,C正确;减数分裂过程中的基因重组为双亲遗传性状的传递提供了最大程度的可能,极大的增强了后代对环境的适应性和生存能力,D正确。论以自然选择学说为基础,是对达尔文理论的发展,A正确

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