题目:
Will __31_______ matter if you don’t take your breakfast? Recently a test __32________ (give) in the United Sates. Those tests included people of different __33________ from 12 to 83. During the experiment, these people were given all kinds of breakfasts, and sometimes they got __34__________ breakfast at all. Special tests were set up to see ___35________ well their bodies worked and when they had eaten ___36_________ certain kind of breakfast. The results show that if a person eats a proper breakfast, he or she will work with better effect __37_________ if he or she has no breakfast. This fact appears to be ___38_________ (especial) true if a person works __39_______ his brains. For example, if a student eats fruit, eggs, bread and milk before going to school, he will learn more quickly and listen with __40_______ (much) attention in class.
答案:
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SiO2 + 2NaOH =Na2SiO3 + H2O 玻璃塞题目分析:写化学方程式首先要确定反应物和生成物,最后不能忘了要配平,由题意得到反应物为二氧化硅和氢氧化钠,产物为硅酸钠和水,由于玻璃中有二氧化硅,所以会和...