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Questions 26 to 28 are based on the passage you have just heard.

A．More than 70 million.
B．More than 1,000 million.
C．More than 2,000 million.
D．More than 6,000 million.

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In the test carried out by Dr.Marzluff and two students, those in neutral mask trapped and banded seven crows on the university campus.

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