题干

有机化学中的反应类型较多,将下列反应归类(填序号).

①由乙炔制氯乙烯 ②乙烷在空气中燃烧③乙烯使溴的四氯化碳溶液褪色

④乙烯使酸性高锰酸钾溶液褪色 ⑤由乙烯制聚乙烯

⑥甲烷与氯气在光照的条件下反应 ⑦溴乙烷和氢氧化钠乙醇溶液共热

⑧溴乙烷和氢氧化钠溶液共热.

其中属于取代反应的是  ____;属于氧化反应的是  ____;属于加成反应的是  ____;属消去反应的是  ____;属于聚合反应的是 ____

上一题 下一题 0.0难度 选择题 更新时间:2017-07-03 12:09:56

答案(点此获取答案解析)

⑥⑧,②④,①③,⑦,⑤

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    Housework is a frequent source of disputes (争论) between lazy husbands and their hard-working wives, but women have been warned not to expect men to pull their weight any time soon.

    A study from Oxford University has found that men are unlikely to be doing an equal share of housework before 2050. Mothers, the researchers warned, will continue to shoulder the burden of childcare and housework for the next four decades, largely because housework such as cleaning and cooking is still regarded as “women's work”.

    The gap between the amount of time men and women spend on housework has narrowed slowly over the past 40 years. But it will take another four decades before true housework equality (平等) is achieved, the study concluded.

    The research found that in the Nordic countries, the burden of housework is shared more equally between men and women. In the UK, women spend an average of four hours and forty minutes each day on housework, compared with two hours and twenty-eight minutes for men. This is an improvement from the 1960s, when British women typically spent six hours a day on housework, while men spent just 90 minutes every day.

    But progress towards housework equality appears to be slowing in some countries. Dr Oriel Sullivan, a research reader from Oxford's Department of Sociology, said, “we've looked at what is affecting the equality in the home, and we have found that certain tasks seem to be given according to whether they are viewed as ‘men's work' or ‘women's work'.”

    Dr Sullivan said cultural attitudes taught at school may be responsible for the views of housework. “At school it is much easier for a girl to be a tomboy, but it is much more difficult for a boy to enjoy baking and dancing,” she said.