题干

请回答下列有关动物行为的问题.

材料一:人有人言.鸟有鸟语.不同的白冠雀的鸣声虽然基调相同.但又有各自的“方言”.如果把某个白冠雀鸟群A的幼体,移到另一白冠雀鸟群B中去.等到a长成成鸟,a的鸣声就不同于A鸟群而接近于B鸟群.但如果把白冠雀的幼体b移到黄莺鸟群中生活.它却学不会黄莺的鸣叫.

材料二:某人做了以下实验:在标本瓶内装几只蟑螂以及它们吃的食物,瓶口用白纱布封住,使瓶内透气.白天用黑纸袋套在瓶外,使瓶内成为暗室;晚上接开黑纸袋,用灯照明,使瓶内成为白天,经过一星期左右,蟑螂调整了自己的节律,在人工的“黑夜”活动了.

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    I was 8 years old when I found out my father was ill. It was 1993, but I can remember my mother's words as if it were yesterday. “Jessica, I don't want you to take food from your father, because he has AIDS. Be very careful when you are around him.”

    AIDS wasn't something we talked about in my country when I was growing up. From then on, I knew that this would be a family secret. My parents were not together anymore, and my dad lived alone. For a while, he could take care of himself. But when I was 11, his condition worsened. My father's other children lived far away, so it fell to me to look after him.

    We couldn't afford all the necessary medication for him, and because Dad was unable to work. I had no money for school supplies and often couldn't even buy food for dinner. I would sit in class feeling completely lost, the teacher's words muffled as I was thinking how I was going to manage.

    I didn't share my burden (负担) with anyone. I had seen how people reacted to AIDS. Kids laughed at classmates who had parents with the disease. And even adults could be cruel. When my father was moved to the hospital, the nurses would leave his food on the bedside even though he was too weak to feed himself.

    I had known that he was going to die. But after so many years of keeping his condition a secret, I was completely unprepared when he reached his final days. Sad and hopeless, I called a woman at the nonprofit (非营利的) National AIDS Support. That day, she kept me on the phone for hours. I was so lucky to find someone who cared. She saved my life.

    I was 14 when my father died. He took his secret away with him, having never spoken about AIDS to anyone, even me. He didn't want to call attention to AIDS. I do.