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TOEFL
/
Listening practice
/ Section WE96
Listen to an Academic Talk
Listen to part of a talk in a biology class.
Listen
45. According to the speaker, what is unusual about a ring species?
A
Its members change appearance according to altitude.
B
Neighbouring groups interbreed but the two ends do not.
C
Its offspring are fertile only in certain seasons.
D
It occupies the same ecological role as a related species.