如图表示雄果蝇体内某细胞分裂过程中，细胞内每条染色体DNA含量变化（甲曲线）及与之对应的细胞中染色体数目变化（乙曲线），下列有关叙述正确的是

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如图表示雄果蝇体内某细胞分裂过程中，细胞内每条染色体DNA含量变化（甲曲线）及与之对应的细胞中染色体数目变化（乙曲线），下列有关叙述正确的是（　　）

A：CD与FG对应的时间段，细胞中均含有四个染色体组

B：D点所对应时刻之后，单个细胞中可能不含Y染色体

C：AE对应的时间段，细胞中含有同源染色体

D：EF所示的DNA含量的变化是由于同源染色体相互分离进入两个子细胞中

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B

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Every school has its own rules. How many1 are there in your school? At some schools, the students2to wear uniforms on school days. But many students don't want to wear the school uniforms. They think the uniforms are the ugly3. But the school doesn't allow students to wear4own clothes at school. So some students draw cartoons or other famous singers on their5. They think it is very6 that all the students wear the same. It isn't very good that teachers and students are wearing7 . But most of the students8the rules. What do you think9? Do you10your school uniforms?

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