题目

阅读理解Maybe you've heard about the saying, “A bird with a broken wing will never fly as high. I'm sure that T. J. Ware was made to feel this way almost every day in school.By high school, T. J. was the most famous troublemaker in his town. He got into lots of fights. He failed almost every exam but was passed on each year to a higher grade level. Teachers didn't want to have him again the following year.When I showed up to lead the first training for a leadership retreat, a program designed to have students become more involved in their communities, the community leaders told me about 如图是染色体和DNA之间关系的示意图，请据图回答下列问题：（1）图中A表示的是______，B表示的是______，C表示的是______。（2）A物质主要由______和______两部分组成，人体中有______对A物质。（3）在C上，有许多具有控制生物性状的小片段，叫作______。（4）若用下图表示染色体、DNA、基因三者在概念上的大小关系，请在图中划线处写出对应的内容：______