阅读短文，然后按要求完成各题。

　　There are many things you can do to improve your memory．Among them are various memorizing methods as well as taking special care of your health．

　　(A)It is important that you regularly stimulate your brain to make your memory more efficient．You can do this(B)通过做你不常做的活动和改变你的日常习惯．Learning a new skill helps your brain to develop．When trying to memorize something, you should focus your attention because this will lower your chances of making accurate memories．

　　An excellent way to help is to link information with pictures．These are referred to as mnemonic techniques(记忆术)．Try to see the images in your mind．Taking notes, being organized and(C)________ a diary will also be useful tools．

　　Healthy food and plenty of vitamins are essential for your memory to work properly．(D)Drinking a lot of water also helps maintain your memory．You must allow your brain to have enough sleep and rest．When you are asleep, your brain stores memory．Not enough sleep can, therefore, cause problems with storing information．In addition, being tired will stop you from being able to concentrate well．Caffeine in tea and coffee are very good at preventing sleepiness and helping concentration, but they can al o cause problems with memory．

　　In order to concentrate well, you must be relaxed．Generally keeping fit and regular health checks are both important as well－not just for improving your memory．

1．写出画线部分(A)所指代的内容：________

2．将画线部分(B)的汉语翻译成英语：________

3．在画线部分(C)空白处填入一个适当的词：________

4．把画线的句子(D)改写成同义句：________ drink ________ water helps to maintain your memory, ________．

5．写出能概括本段文章的主题句：________