Skip to content
Prep
Freely
Home
TOEFL
IELTS
Guides
Log in
Sign up
P
Account
Profile
My progress
Settings
Log out
TOEFL
/
Listening practice
/ Section HLE6
Listen to an Academic Talk
Listen to part of a talk in a chemistry class.
Listen
25. What is the talk mainly about?
A
How canning preserves food, and the problems it created
B
Why glass jars were replaced by metal tins
C
The life and career of Nicolas Appert
D
How vitamin deficiencies were first identified