A good way to pass an exam is to work hard every day in the year.You may fail in an exam if you are lazy for most of the year and then work hard only a few days before the exam.If you are taking an English exam,do not only learn rules of grammar.
Try to read stories in English and speak English whenever you can .A few days before the exam you should start going to bed early .Do not stay up late at night studying and learning things .Before you start to answer the questions,read carefully over the question paper.Try to understand the exact meaning of each question before you pack up your pen to write .When you have at last finished your exam,read over your answers .Correct the mistakes if there are any mistakes and make sure that you have not missed anything out.
小题1:What is the passage about?
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小题2:What will happen if you work hard only a few days before the exam?
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小题3:What should we do before the exam?
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小题4:What should we do before answering the questions?
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小题5:.What should we do after finishing the exam?
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某种一氯代物存在顺反异构，写出其中空间结构为“反式”的结构简式 。