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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
26. According to the speaker, what is the principle behind canning?
A
Cooling the food so that microorganisms cannot grow
B
Removing all the water so that nothing can survive
C
Killing microorganisms with heat and keeping others out with a seal
D
Adding chemicals that prevent spoiling