题目

氢氟酸(HF)对玻璃有腐蚀作用，可用在玻璃上雕刻各种精美图案，也可用在玻璃仪器上标注刻度及文字。氢氟酸与玻璃发生的反应可以表示为：SiO2＋4HF===X↑＋2H2O，关于物质X的组成，下列说法正确的是(     ) A. 可能含有氢元素 B. 可能含有氧元素 C. 一定含有硅元素、氟元素 D. X是一种氧化物 答案：CMost middle school students find it boring to learn English. But students in Yat Sen middle school in New York, US, don’t think so. Why? Because they are in the school of One Program, which asks students to work on their own or in small groups on computers to have math lessons. “The program gives the students a new learning style. No traditional classroom can compare with it. We give each lesson according to the students’ interest and their strong and weak points,” said JoelⅠ. Klein, the school’s head teacher, “we’re looking for a new way that interest students children.” Students enjoy these math lessons, especially lessons with video games. They must find out the answers to math problems to get through the game. One such game is Dimension M. As students move through mazes(迷宫) with their keyboards, some questions come up. Caleb Deng had to answer the question: What is 5+ (6×3)? He calculated on paper quickly because there was just a minute left to play. “ I was right,” said Deng, 14, as he ended the game with a high score (高分). “this really makes math lessons more exciting, since we are fighting to learn better.” 1.Students in Yat Sen Middle School like math because __________.  A. they work in large group B. they can work on computer C. the teachers are interesting D. math questions are easy there  2.Which is NOT true of the program?    A. It is very successful.    B. It is boring to most students.    C. It makes learning math more interesting.    D. It gives the students a new way to learn. 3.The underlined word “calculated” in Paragraph 4 most probably means __________.    A. worked out    B. wrote down     C. threw away    D. gave up 4.Caleb Deng’s story serves as an example to show ___________. A. how students work in small groups B. how to end a game with a high score C. how the question 5+(6×3) should be solved D. how students learn math through video games 5.This article is mainly about ___________.    A. how to learn math well B. an interesting math lesson C. a new way to learn math D. kids in Yat Sen Middle School