[解析]
C 19.A 20.A
【原文】W：Good morning，everyone.I'd like to talk about reading today.Thereare two things that you should do before reading a passage.One is to consider your reason for reading.Are you reading only for the pleasure？Or are you reading to search for some facts？Your purpose should decide how you read.Secondly，you should think about what the passage will tell you.What do you already know about
that topic？This will help you to have a better understanding of the passage you are preparing to read.When you are ready to read，you should begin by skimming the passage，that is，read quickly through the passage.In doing so，you should pay attention to the title and note the key words.While skimming，you should always make a note of the topic sentence of each paragraph.The topic sentence often contains the main idea of the paragraph.Once skimming is done，you should read through the passage in more detail.
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