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TOEFL Directory > TOEFL writing > TOEFL Listening Class Unit 1 Passage 20
TOEFL Listening Class Unit 1 Passage 20
First of all, you need to know what is TOEFL listening Pattern.
Second, in the course of listening, just pay attention on what you know, if you missed something, just let it go . don't try to figure out what you missed .
Finally, after finishing the passage, don't go answers immediately. use about 5 seconds to review the passage specially last two sentence. then go answers one by one. don't saty in one question for a long time.
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144. What does the professor mainly discuss?
Various methods of determining the authenticity of
vanilla extract
Problems in manufacturing vanilla products
The difference between natural and imitation vanilla
extract
The dangers of consuming imitation vanilla extract
145. What is the source of imitation vanilla extract?
The leaves of the vanilla plant
A component of wood
An alcohol and water solution
The vanilla bean
146. Why might some consumers prefer imitation vanilla
extract over natural vanilla extract?
Imitation vanilla extract tastes better.
Imitation vanilla extract is less expensive.
Imitation vanilla extract does not spoil as quickly.
Imitation vanilla extract has fewer calories.
147. What does the professor say can be determined by
inspecting the carbon atoms in the vanilla products?
The source of the vanillin molecules
The age of the products
Whether the products are safe to consume
Which product will taste better
148. What does the professor suggest the students do?
Avoid purchasing imitation vanilla extract
Convert some lignin into vanillin
Check the labels of the vanilla flavoring in their
kitchens
Smell the two vanilla products he brought to class
Listen to the passage again and check out the script and correct answers.
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