题目

阅读理解 Yesterday Icleared up my house and I mean really cleared up my house. The room that gavethe most results was my husband's office. There I found: oneright-footed shoe, size 10 (he lostthe other one somewhere), a set of Star Wars videos and two small china catssomeone gave me last birthday. I collected these finds and tookthem downstairs and logged (登录）on to eBay: theanswer to all our rubbish. What is eBay? Itaims to provide a global trading platform where almost anyone can trade almost anything. The idea came fromPierre Omidyar. Born in Paris, Omidyar moved to Washington when如图表示的是染色体和DNA的关系，请据图回答问题。 （1）图中a表示的结构是（　　）；图中b表示的结构是（　　） （2）主要的遗传物质是（　　），而遗传物质的主要载体是（　　） （3）控制人类各种性状如有、无耳垂等的是 [　　] A．DNAB．基因 C．蛋白质D．染色体