Passage2
Huang Louise,a junior geology major,decided to give an informative speech about how earthquakes occur.
From his audience analysis,he learnt that only two or three of his classmates knew much of anything about geology.
Huang realized then that he must present his speech at an elementary level and with a minimum of scientific language.
As he prepared the speech,Huang kept asking himself:"how can I make this clear and meaningful to someone who knows nothing about earthquakes or geological principles?"
Since he was speaking in the Midwest,he decided to begin by nothing that the most severe earthquake in American history took place not in California or Alaska,
but at New Madrid,Missouri in 1811.
If such an earthquake happened today,it would be felt from the Rocky Mountains to the Atlantic Ocean and would flatten most of the cities in the Mississippi Valley.
That,he figured,should get his classmates' attention.
Throughout the body of the speech,Huang doubt only with the basic mechanics of earthquakes and carefully avoided technical terms.
He also prepared visual aids diagramming photo lines so his classmates wouldn't get confused.
To be absolutely safe,Huang asked his roommate who was not a geology major to listen to the speech.
"Stopme", he said,"Anytime I say something you don't understand".
Huang's roommate stopped him four times.
And at each spot,Huang worked out a way to make his point more clearly.
Finally,he had a speech that was interesting and perfectly understandable to his audience.

Questions 30 to 32 are based on the passage you have just heard:
Question 30:What did Huang Louise learn from the analysis of his audience?
Question 31:How did Huang Louise start his speech?
Question 32:What did Huang ask his roommate to do when he was making is trial speech?