题目

下列关于细胞体积与物质运输的关系的叙述，正确的是() A . 与原核细胞相比，真核细胞体积一般较小 B . 随着细胞体积的增大，物质运输速率随着增大 C . 哺乳动物成熟红细胞的表面积与体积之比相对较大，有利于提高气体交换效率 D . 卵细胞体积较大，有利于和周围环境进行物质交换，为胚胎早期发育提供所需养料Mr. Dawson was an old man with a bad temper(脾气). And everyone in town knew it. Kids were afraid to go into his yard to pick apples.One Friday, 12-year-old Janet and her friend Amy had to walk past Mr. Dawson’s house. When Janet saw him, she suggested crossing the street to the other side. But Amy said they needn’t.When Mr. Dawson saw Amy, he smiled and said, “Hello, Amy! I see you have a new friend with you today.” Amy smiled back and told him that Janet would stay with her that night. Mr. Dawson looked friendly and gave them each a fresh apple. The girls were glad to get them.Later Janet asked Amy, “Everyone says he is the most unwelcome person in town. Why was he so kind to us?” Amy explained that when she first walked past his house, she was also afraid of him. But she pretended(假装) there was an invisible (看不见的) smile on his face and so she always smiled back at him. It took a long time, but one day he half-smiled back at her, and then started talking to her.“An invisible smile?” Janet was puzzled. “Yes,” answered Amy, “My grandma told me to think so. She says smiles can run around. If we keep smiling at someone, sooner or later he will really smile back.”Remember what Amy’s grandma said, and we will find that most people can’t refuse our smile.1. What did people feel about Mr. Dawson? （不超过10个词）2. Who did Amy learn “an invisible smile” from? （不超过10个词）3.What does the writer want to tell us? （不超过20个词）