题目

⑴人的骨骼肌细胞中ATP的含量只能维持剧烈运动3 s以内的能量供应。某运动员参加短跑比赛过程中，肌肉细胞中ATP的相对含量随时间的变化如下图所示。请根据图回答下面的问题： ① a→b的变化过程，ATP被水解，释放的能量用于————————————————————————。 ② b→c过程中，ATP含量增加，说明————————————————————————加强，释放更多的能量，供ADP合成ATP，补充消耗的ATP。 ③ 从整个曲线看，肌细阅读短文，根据要求完成下面各小题。In China, many students spent their weekends studying at school or doing homework or watching TV at home. What did the students do on weekends in America?Donna: I studied all weekend. On Saturday, I studied for a math test all day. On Sunday morning, I did my history homework. 43. In the evening, I talked to my friends on the phone.Glen: I had a great weekend. I visited some of my friends. 44. On Sunday night, I went to the park with my parents. We really enjoyed ourselves. Judy: I had a boring weekend. On Saturday, I cleaned the house, and I washed the clothes. On Sunday, I painted(喷漆) my bedroom. It was really a tiring weekend. Alan: Last weekend, I stayed at home. I watched old videos(录像) on Saturday. And on Sunday, I saw an old movie. It was an interesting weekend. 根据短文回答问题。1.What did Judy do on Sunday? _____________________________________________________2.How was Alan’s last weekend?_____________________________________________________将短文中画线的句子译成汉语。3.________________________________________________4.________________________________________________为短文拟一个恰当的英文标题5._________________________________________________