第三节(共3小题；每小题1.5分，满分4.5分)
听下面一段材料。将第18至第20三个小题的信息补充完整，每小题不超过三个单词。听材料前，你将有时间阅读各个小题，每小题5秒钟；听完后，各小题将给出15秒钟的作答时间。本段材料读两遍。
Advice for Lectures at University
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Suggestions |
Purposes |
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First: Review previous lecture notes． |
To refresh your memory of the important things which have been discussed and help you l8．____ |
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Second：Look at your 19．________． |
To find out what the lecture may contain． |
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Third：Look at any handouts of the lecture． |
To understand the backgrounds of what will be talked about． |
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Finally：Get go 20．________ready． |
To help you focus on the lecture itself． |
