A:木炭在氧气中燃烧:C+O2 点燃_ CO2 化合反应
B:过氧化氢溶液制取氧气2H2O2═2H2+O2↑ 分解反应
C:硫在氧气中燃烧S+O2═SO2 氧化反应
D:细铁丝在空气中燃烧4Fe+3O2═2Fe2O3 化合反应
阅读材料,完成下列要求。
材料:分田到户、包产到户在那些已经使用机械生产的平原地区显然是倒退。因为单干就要废弃机耕,实行畜耕和人耕,而农业现代化的表现就是耕作机械化。但是,人少地多,干部分配不公,农民宁愿出力出汗也愿意分田到户。“从机耕到人耕,确实令人感到可笑,但农民的生产积极性却高涨起来了。他们不惜出力出汗,也要把地种好,为了能畜耕,他们自动地互相换地,然后或一家买牲口,或两三家合买牲口,一时牲口的价格猛涨。原来一匹大牲口不过1000元,小毛驴只卖三四百元,后来大牲口涨价到1500元以上,小毛驴更时兴,涨到了800元以上。”
——摘自任世江《高中历史必修课程专题解析》
评材料中关于“分田到户、包产到户”的观点。(要求:围绕材料中的一种或两种观点展开评论;观点明确,史论结合。)
下列计算正确的是( )
动词填空 用括号内所给动词的适当形式填空,并将答案写在答题卡标有题号的横线上。⑴It's said that the new film directed by Feng Xiaogang ____ (film) in two months.⑵Why didn't David come to my birthday party yesterday? He ____ (go) to Beijing.⑶The novel she devoted most of her lifetime to ____ (come) out last month.⑷When I got home, I was surprised to find my son ____ (prepare) for tomorrow's test.⑸It's reported that this kind of fashionable bag ____ (carry) easily.⑹Oh, my god! Little Tom seems to be sad. I guess something ____ (happen) to him.⑺Would you please not ask any more? I'd rather____ (not tell) you about it.⑻What happened to you? I nearly hit a person on my way home last night. I could hardly see the road clearly because it____ (rain) so heavily.