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阅读下列材料,回答问题:

材料一  三国以前,中国的政治、经济中心大多在北方,长江以南的地区还非常落后。……东晋、南朝时期,长江中下游一带的农业发展迅速。许多水利工程被修建,大片的荒地被开垦为良田。生产技术也得到了很大的进步。

材料二  魏晋以来(东汉末年以来),原居中原的客家先民不堪战乱离苦和灾荒,纷纷从黄河流域向南逃往长江流域,最后定居在闽粤赣交界地区。他们带来了中原先进的生产技艺,并与原居的闽越族长期相处,逐渐形成客家人。

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    If you work hard to have a positive attitude, you might be surprised by how much better you feel about yourself and life in general. ____ The less stress you feel, the better you will feel generally. So if you've been feeling tired, think about the good, put on a happy face and you just might feel better soon.

    But how can you have a positive attitude when life is hard? It's more than just turning life's lemons into lemonade. ____ But it's worth it. Here are some ways you can develop and maintain(保持)a positive attitude even in the midst of life's troubles.

    ____It just means being an optimist and looking for the good in things, rather than being a pessimist(悲观者) and focusing on the bad in things. Sometimes your view can make all the difference in the world.

    Identify(确认) those areas of your life that might not be going so well. ____ Focus on one area at a time and think of ways you can find the positive in them.

    Smile and laugh! Yes, it can be that simple. Learn to love life, no matter what's going on. Smile at others and they will smile back at you.____Sometimes laughter really is the best medicine.

    Exercise!Get off the couch and get moving. Being active and healthy can give you a completely different attitude to life.

A. Have fun and find the humor in life.

B. You may find it hard to stay positive in your life.

C. Having a positive attitude can take some hard work.

D. A positive attitude doesn't mean taking no notice of life's troubles.

E. Having a positive attitude can also reduce your stress level.

F. These are the areas likely to make you think negative thoughts.

G. Go to bed earlier so you get the sleep you need to feel positive.