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TOEFL
/
Listening practice
/ Section 6L4G
Listen to an Academic Talk
Listen to part of a talk.
Listen
43. What does the speaker imply about collecting more records from the same survivors?
A
It guarantees an unbiased picture of every business.
B
It can increase detail without correcting the selection problem.
C
It makes all older records unusable.
D
It is useful only if directories are destroyed.