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TOEFL
/
Listening practice
/ Section 6KLG
Listen to an Academic Talk
Listen to a talk in a technology class.
Listen
43. What can be inferred about why QR codes became so widespread?
A
They were free to use, and phones could read them.
B
They replaced all barcodes by the 1990s.
C
The government required companies to use them.
D
Toyota sold them to other companies.