材料一:君君、臣臣、父父、子子。
――《论语》
材料二:君有过则谏,反复之而不听,则去。……君之视臣如土芥,则臣视君如寇仇。
――《孟子》
材料三:唯天子受命于天,天下受命于天子……君为臣纲。
――《春秋繁露》
材料四:天理,只是仁义礼智之总名,仁义礼智便是天理之件数。……天理存则人欲亡,人欲胜则天理灭。
――《朱子语类》
请回答:
July 4 is the birthday of the United States of America. Since 1776, people have 1 the Independence Day holiday every year. What do people 2on Independence Day? Many colorful and interesting things. They have fireworks shows in the evenings and sing songs. Some families organize picnics with barbecues (烧烤). Kids can3much delicious food like hotdogs. And these parties are a good time to dress up. Some kids make July 4 hats 4 the stars and stripes(星条) of the country's flag on them. And Independence Day is in summer. Many kids use stars and stripes fans to keep themselves 5 . It's a great day, but no one forgets that it's6too. US people are proud of their 7 and proud of what the founders did for it. On Independence Day everyone gets the chance to show it.
煤气中添加少量有特殊臭味的乙硫醇(C2H5SH),可以提醒人们煤气泄露。乙硫醇在煤气燃烧过程中也可以充分燃烧,其反应的化学方程式为:2C2H5SH+9O24CO2+2X+6H2O,则X的化学式为( )