Rock climbing is a popular hobby that many people enjoy doing. You can do it indoors on special walls or outdoors on real mountains. There are many advantages of rock climbing—it is fun and it also helps people forget worries.

    The most important equipment(装备)to have is good shoes. They need to be half a size smaller than your usual size. The next thing you need is a harness(保护带).This allows you to move freely, but will hold you up if you fall. It's important to know how to use your equipment. Otherwise, it may be dangerous. If you are a beginner, it's best to have lessons. A climber with experience can help you a lot in the beginning.

    Rock climbing is very exciting for people of different ages. Climbers, however, must be careful not to pollute the environment. Sometimes rock climbers leave rubbish on the mountains where they climb. They should take it with them and throw it away. This will allow future climbers to enjoy a clean environment.

    You are invited to a large party. Loud music is playing, and lots of people are dancing. Do you dance or talk to as many people as you can call all night? Later, you cannot fall asleep—you want more conversation! Or do you prefer a quieter corner? Or perhaps you cannot wait to go home early and relax by yourself.

    Which of these people sound most like you? Person A, who tries to talk to everyone and stays late? Or Person B, who prefers to keep quiet and leaves early?

    If you said Person A, you are probably more extroverted（性格外向的）. If you said Person B, you are probably more introverted（内向的）. Or perhaps you are Person C and fall somewhere in the middle. Introverted and extroverted people are two commonly used words to describe a person's personality. And they are also commonly misused and misunderstood.

    Introverts may be thought as quiet, shy and timid. Extroverts may be thought as bold, confident, loud and full of energy. Introverted and extroverted people may fit those descriptions. But these same descriptions do not define（下定义）introversion and extroversion properly.

    Introverts and extroverts use their brains differently, and they get their energy differently. Introversion is the state of being mostly concerned with one's own mental life. Extroversion is the opposite. Extroversion is the state of being mostly concerned with what is outside oneself.

    People who consider themselves introverts may say they “need to be alone to charge their batteries”. However, introverts may still live being social and going to parties. But such activities require time to prepare.

    Extroverts may say, “I don't need ‘alone time', I feel more relaxed being around other people.” Even so, extroverts can still feel unsure or not confident among other people.

    So where do you fall on the introversion/ extroversion chart?

    Many other people and I in Britain love charity shops because we can find them on every street．The charity shops sell all kinds of things and they are very cheap．

The first charity shop was opened by Oxfam in 1947．Now there are over 7,000 charity shops in the UK．My favorite charity shop in my hometown is the Cross Shop．There I always find children's books，all 10 to 20 pence each．They are really cheap．

    Most of the shop workers in charity shops are volunteers，    each shop has a manager and he gets some money．Every morning you see bags of things outside the shops．Some people bring and put them there without waiting for thanks．In fact，over90％of the things in charity shops are from kind people．

    All the money the shops get goes to charity work．Charity shops raise more than 110 million pounds every year．The money is for sick and poor children。homeless and disabled people，and many others．In a charity shop you can get cheap but nice things．You might even feel special while shopping．

   If possible，let's do something for charity together．

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