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TOEFL
/
Listening practice
/ Section GTF3
Listen to an Academic Talk
Listen to part of a talk.
Listen
40. What is the talk mainly about?
A
Why local clocks became less accurate as trains grew faster.
B
How nineteenth-century travelers measured the speed of the sun.
C
How railway coordination encouraged a shift from local solar times to shared time standards.
D
How railroad engineers discovered that sunlight affects clock mechanisms.