题目

The best way to pass exams is to work hard every day.You may not pass an exam if you work hard only a few days before the exam.If you are getting ready for an English exam，try to revise the words first. You can read the words more and practice more. If you are getting ready for a maths test，do more exercises.Before you start the exam，read the questions carefully. Try to understand the exact meaning of each question before you pick up your pen to write. When you finish your exam，read your answers once more，correct the mistakes (错误) if there are any and make sure that you don’t m若梯形中位线长是高的2倍，面积是18cm2，则这个梯形的高等于 [     ]A．6cmB．6cmC．3cmD．3cm