题干

如图为某人的染色体组成图.相关判断正确的是(  )

A:图中共有23条染色体

B:每条染色体上只有一个基因

C:该图表示女性体细胞的染色体组成

D:染色体主要有DNA和蛋白质组成

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答案(点此获取答案解析)

C,D

同类题2

任务型阅读

    A few days ago, I ran into (撞上) a stranger as he passed by. I said sorry to him, and he said, “Excuse me too, I wasn’t even watching for you.” We were very polite, this stranger and I. Then we went on our way after saying goodbye.

    Later in the kitchen at home, as I cooked our meal, my daughter Betty walked up to me, very quietly. When I turned around (转身), I nearly knocked her down. “Get out of the way!” I shouted angrily. She ran away, crying.

    That night, when I lay in bed, my husband said to me, “You were so rude to Betty. Go and look around on the kitchen floor, and you'll find some flowers there. Betty brought those for you. She picked them herself ¾ pink, yellow, and your favorite blue.”

    When I heard this, I thought deeply: “While meeting with a stranger, I was calm and polite; but with my daughter, I was not patient (耐心的). I felt sad and tears began to fall.

    I quietly went to Betty's bed, “Wake up, my dear,” I said, “Are these the flowers you picked for me?” She smiled, “I found them by the tree. I knew you'd like them, especially the blue.” I said, “I am so sorry that I treated (对待) you that way today.” And she whispered (悄声说), “Mommy, that's okay ¾ I still love you anyway.” I kissed her and said, “I love you too and I do love the flowers.”

    That day Betty gave me a lesson on how to get along with each other in the family. I spent much time on work before and didn't realize how important family life was. I decided to do better in the future.