“它是1898年中国最轰动的出版物，它介绍了达尔文的进化论思想，提出了‘物竞天择，适者生存’的观点。”这部著作是（     ）

中共中央某文件指出：“可以在生产队统一核算和分配的前提下，包工到作业组，联系产量计算劳动报酬，实行超产奖励。不许分田单干。……社员自留地、自留畜、家庭副业和农村集市贸易……不能当作所谓资本主义尾巴去批判。”这份文件最有可能发布于(     )

氢气在氧气中燃烧的实验说明，水是由 ____组成的；请写出氢气在氧气中燃烧的化学方程式 ____

    In England, people often talk about the weather because they can experience (经历）four seasons in one day. In the morning the weather is warm just like in spring. An hour later black clouds come and then it rains hard. The weather gets a little cold. In the late afternoon the sky will be sunny, the sun will begin to shine, and it will be summer at this time of a day.

    In England, people can also have summer in winter, or have winter in summer. So in winter they can swim sometimes, and in summer sometimes they should take warm clothes.

    When you go to England, you will see that some English people usually take an umbrella (伞）or a raincoat with them in the sunny morning, but you should not laugh at them.

    If you don't take an umbrella or a raincoat, you will regret (后悔)later in the day.

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