如图，圆内接四边形ABCD两组对边的延长线分别相交于点E，F，且∠A=55°，∠E=30°，则∠F=____ .

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书面表达

假如你叫Tina,你校每年都在世界水日(World Water Day)开展丰富多彩的活动,宣传节约用水,请你根据下面的提示写信向你的笔友Nick介绍你们的活动情况。

要求：

①短文应包括表格中所有要点,可适当发挥；

②文中不得出现真实的人名、校名等相关信息；

③词数80词以上, 文章开头和结尾已给出, 不计入总词数。

Dear Nick,

I'm happy to hear from you. Let me tell you what we often do on World Water Day.……

下列关于我国土地资源构成的说法，正确的是（    ）

    Good habits are important to us. We should build good living habits. Now let's have a look at the two brothers. Li Qiang and Li Gang are brothers. But their living habits are different. Now let's go to Li Qiang's room. Li Qiang cleans his bedroom every day and puts his things away. Look! There is a computer on the desk. There are two balls under the bed. A guitar and a kite are on the wall. Some books are on the shelf. So he must be a careful boy. Now let's go to Li Gang's room. The room is not clean. Can we see his clothes on the desk? Oh, yes. We can see a football and a knife on the desk, too. Li Gang never does any cleaning on weekends. So his room is in a mess.

    What do you think of Li Qiang and Li Gang? Li Qiang is a good boy. Li Gang must learn from his brother