We're staying with Lingling's uncle in Hunan Province, and I'm having ____ (冠词) wonderful time here in Zhangjiajie. It's a magic land of mountains, forests and ____ (river). It's very large, about 480 square kilometres. It's famous  ____ (介词) the strange shape of its tall rocks. Some of them ____ (look) like humans while others look like wild animals. Last night we camped by a small lake. During the night, we____ (hear) a noise! It woke everybody up. We thought somebody  ____ (be) moving about. Lingling's uncle said it was an animal. We came out without  ____ (make) any noise, ____ (连词) found it was just a hungry monkey looking for food. This morning, we climbed Mount Tianzi! From the top we hoped to see the lakes and forests. But it was a pity that it was____ (cloud). We could only see the mountain tops above the clouds. Tomorrow we're going to Dongting Lake, ____ (冠词) second-largest freshwater lake in China. We'll be back home next week! Wish you were here.

    When asked about happiness, we usually think of something extraordinary, an absolute delight, which seems to get rarer as we get older.

    For kids, happiness has a magical quality: Their delight at winning a race or getting a new bike is unreserved (毫不掩饰的).

    In the teenage years, the concept of happiness changes. Suddenly it's conditional on such things as excitement, love and popularity. I can still recall the excitement of being invited to dance with the most attractive boy at the school party.

    In adulthood the things that bring deep joy－love, marriage, birth－also bring responsibility and the risk of loss. For adults, happiness is complicated (复杂的).

    My definition of happiness is “the capacity for enjoyment”. The more we can enjoy what we have, the happier we are. It's easy to overlook(忽视) the pleasure we get from the company of friends, the freedom to live where we please, and even good health.

    I experienced my little moments of pleasure yesterday. First I was overjoyed when I shut the last lunchbox and had the house to myself. Then I spent an uninterrupted morning writing, which I love. When the kids and my husband came home, I enjoyed their noise after the quiet of the day.

    Psychologists tell us that to be happy we need a mix of enjoyable leisure time and satisfying work. I don't think that my grandmother, who raised 14 children，had much of either. She did have a network of close friends and family, and maybe this is what satisfied her most.

    We, however, with so many choices and such pressure to succeed in every area, have turned happiness into one more thing we've got to have. We're so self-conscious about our “right” to it that it's making us miserable. So we chase it and equal it with wealth and success, without noticing that the people who have those things aren't necessarily happier.

    Happiness isn't about what happens to us－it's about how we see what happens to us. It's the skillful way of finding a positive for every negative. It's not wishing for what we don't have, but enjoying what we do possess.

若x^m=3，xⁿ=5，则x^m+n等于（　　）

同学们依据物质类别和物质中某种元素的化合价构建了初中化学常见物质间的转化关系坐标图（图中“→”表示物质间的转化）．

请回答下列问题：
（1）工业上可用化合反应来制备B，且反应时放出大量热，B的俗称为____

（2）E的固体露置在空气中一段时间后质量会增加，其原因是____

（3）H、G均可与F溶液反应，分别生成含该金属元素的两种盐溶液，则G与F溶液反应的化学方程式为____．
（4）在B溶液中加入一定量D溶液，过滤后取滤液，滴入过量F溶液，无明显现象，则滤液中的溶质是（写出所有可能）____．
（5）已知金属铝可与E溶液反应生成偏铝酸钠（NaAlO₂）和一种最轻的气体，写出该反应的化学方程式____．
（6）A～M九种物质中能与F溶液反应的物质有____种．