题目

木糖醇（C5H12O5）是一种天然、健康的甜味剂，常用于口香糖、甜品等的制作。木糖醇为白色晶体或结晶性粉末，极易溶于水，微溶于乙醇与甲醇，熔点92~96℃，沸点216℃，10%水溶液pH5.0～7.0。按要求计算： （1） 木糖醇的 10%水溶液 pH5.0～7.0，这种性质属于性质。（填“物理性质”或“化学性质”） （2） 木糖醇中 C、H、O 质量比为。 （3） 15.2g的木糖醇晶体中含有的C元素的质量为。阅读选择It' s about 4: 30, after three classes. It's time for sports. The students are on the playground. They are playing a football match. Li Dong is one of them. He is good at football. He plays well. He is on the school football team. Li Dong says,”I like playing football. It's my favourite sport,” Li Dong is playing with his classmates Pan Chen and Wang Hai. They say, “He is a football fan. Ronaldo is his favourite player.”Look at the boys around the basketball court. Many boys are watching a basketball match. The tall boy, Tang Lin, is very good at playing basketball. He runs very fast and he plays well. Many of his friends say,“He is good at basketball. His favourite basketball player is Yao Ming. His team is sure to win.”I hope they will be good players of our country in the future.【1】When is the time for sports at school? ( )A. After two classes.B. At about half past four.C. In the morning.D. In the evening.【2】What is Li Dong doing in the passage(文章)? ( )A. He is talking to his friends.B. He is playing football.C. He is having classes.D. He is playing basketball【3】Where may(可能) Wang Hai be at 4:30? ( )A. In the classroom.B. In the shop.C. On the playground.D. At home.【4】Who is Tang Lin's favourite basketball player? ( )A. Pan Chen.B. Ronaldo.C. Li Dong.D. Yao Ming.【5】What is the best title(标题) or the passage? ( )A. A Football Match.B. The English Class.C. My Favourite Basketball Player.D. Sports Time.