A:2C2H2(g)+5O2(g)═4CO2(g)+2H2O(l)△H=﹣2bkJ/mol
B:C2H2(g)+ 52 O2(g)═2CO2(g)+H2O(l)△H=2bkJ/mol
C:2C2H2(g)+5O2(g)═4CO2(g)+2H2O(l)△H=﹣4bkJ/mol
D:2C2H2(g)+5O2(g)═4CO2(g)+2H2O(l)△H=bkJ/mol
“万里长沙”“千里石塘”是明清两代对哪里的称呼( )
—Good! You can_____ a special gift for her.
【中外历史人物评说】根据材料,回答问题。
材料一 林肯政府最初对战争的艰巨性估计不足,1861年7月匆忙组织起来的联邦军在进攻中遭到惨败。战争之初,林肯政府回避南方各州奴隶制的存废问题,拒绝黑人参加联邦军作战,这赢得了北方部分民主党人的支持,并使得西南边境上的4个蓄奴州继续留在联邦之内。共和党内的激进派要求林肯政府扩大战争目标,马上宣布废除奴隶制并采取革命措施。林肯审时度势,1862年5月颁布了《宅地法》。 1862年9月林肯发表了《解放宣言》,宣布自1863年1月1日起,叛乱地区的奴隶从此永远获得自由;凡条件适合者可以在陆海军服役。
——摘编自齐世荣《世界近代史》
材料二 我在这场斗争中的最高目标就是要拯救联邦而不是拯救或摧毁奴隶制。如果为了拯救联邦而不解放任何一个奴隶,我愿意那样做;如果为了拯救联邦而需要解放所有的奴隶,我愿意那样做;如果为了拯救联邦需要解放一部分奴隶而让另一部分奴隶听天由命,我也愿意那样做。
——摘自1862年林肯写给《纽约论坛报》编辑的回信
“Cool" is a word with many meanings.Its old meaning is used to express a temperature that is a little bit cold.As the world has changed,the word has had many different meanings. “Cool"can be used to express feelings of interest in almost everything When you see a famous car in the street,maybe you will say,“It's cool." You may think,“He's so cool," when you see your favorite footballer. We all maximize(扩大) the meaning of “cool". You can use it instead of many words such as “new" or "surprising".Here's an interesting story we can use to show the way the word is used.A teacher asked her students to write about the waterfall(瀑布)they had visited.On one student's paper was just the one sentence, “It's so cool.Maybe he thought it was the best way to show what he saw and felt. But the story also shows a lack of words.Without “cool”,some people have no words to show the same meaning.So it is quite important to keep some credibility(可信性).Can you think of many other words that make your life as colorful as the word "cool"? I can.And I think they are also very cool.