单项选择题

A．5 blocks.
B．6 blocks.
C．8 blocks.
D．10 blocks.
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单项选择题
A．Doctor and patient.B．Professor and student.C．Receptionist and guest.D．Boss and worker.
A．Doctor and patient.
B．Professor and student.
C．Receptionist and guest.
D．Boss and worker.
填空题
The main reason for the reduction of the species of freshwater fish is ______.
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