下列各组热化学方程式中，△H1＜△H2的是
①C(s)＋O2(g)===CO2(g) △H1 C(s)＋O2(g)="==CO(g) " △H2
②S(s)＋O2(g)===SO2(g) △H1 S(g)＋O2(g)===SO2(g) △H2
③H2(g)＋O2(g)===H2O(l) △H1 2H2(g)＋O2(g)===2H2O(l) △H2
④CaCO3(s)===CaO(s)＋CO2(g) △H1 CaO(s)＋H2O(l)===Ca(OH)2(s) △H2
A．①
B．②③④
C．④
D．①②③
答案：A
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| Hello, I'm Li Wei. Tom, Mary and Roy 16 my friends. Tom and Mary are from the U.S.A., and Roy 17 from Germany. I'm Chinese. We're not from 18 country (国家), and speak 19 languages(语言), 20 we are good friends. They live 21 their own country with their fathers and mothers. I often 22 letters from 23 . In summer(夏天), they often 24 to China and visit the Tian'anmen Square( * * ), the Great Wall and the Forbidden City(紫禁城). They 25 China and Chinese food very much. We are friendly(友好) to them, too. | |||
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