①2Fe2O3(s)+3C(s) ⇌ 4Fe(s)+3CO2(g) ΔH1=+468kJ/mol
②C(s)+CO2(g) ⇌ 2CO(g) ΔH2=+172.7 kJ/mol
丁丁在计算一个两位数加30时，把3加到了个位上，得到的结果是57。正确的结果是多少?
选择适当的单词, 完成短文。
cooked, was, goes, visited, washed, cleaned, stayed, drank
My mother ____busy last weekend. She usually ____to the park on weekends. But last weekend she ____at home. She ____the clothes and ____ our house, then she ____my grandparents on Sunday after-noon .They ____ tea together. My mother ____a big dinner for my grandparents. How happy they were!
