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TOEFL
/
Listening practice
/ Section HLE6
Listen to an Academic Talk
Listen to part of a talk in a chemistry class.
Listen
27. Why does the speaker point out that the method was in use before anyone understood it?
A
To criticise Appert for working without a theory
B
To question whether technology always grows out of science
C
To explain why the method spread so slowly at first
D
To show that Pasteur's work added little of practical value