题目

下列有机反应方程式书写错误的是 A．+HNO3 +H2O B．CH2===CH2＋H2OCH3CH2OH C．2CH3CHO＋O2 2CH3COOH D．CH3COOH＋CH3CH2OHH2O+CH3COOCH2CH3 答案：A 【详解】 A．硝基苯中形成N-C键，反应的化学方程式为+HNO3+H2O，故A错误； B．乙烯与水的加成反应为CH2═CH2+H2O CH3CH2OH，故B正确； C．乙醛的催化氧化反应为2CH3CHO+O2  2CH3COOH，故C正确； D．乙酸与乙醇发生酯化反应的化学方程式为CH3COOH+CH3CH2OH CH3COOCH2CH3+H2O，故D正确； 答案选A。Complete the sentences with the given words in their proper forms（用括号中所给单词的适当形式完成下列句子）：【1】It's common knowledge that computers are super _______.（calculate）【2】Could you tell me the _______ of the Great Wall in China.（long）【3】My _______ of English is rather poor. I should work hard at it.（know）【4】We seem to have forgotten the true _______ of Christmas.（mean）【5】Which is _______ from our school, the Science Museum or the Century Park?（far）【6】Jack was _______ of his mistake until his teacher told him about it.（aware）【7】It's not easy to _______ this new washing machine.（operation）【8】When computers are thrown away, their _______ can get into the ground water.（chemistry）