单项选择题

A．The increased pressure.
B．The coldness and the darkness.
C．Breathing.
D．Dangerous sea lives.
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单项选择题
A．About 72,000.B．About 17,855.C．About 75,000.D．About 650,000.
A．About 72,000.
B．About 17,855.
C．About 75,000.
D．About 650,000.
单项选择题
A．Doctor and patient.B．Chemist and patient.C．Nurse and patient.D．Physician and patient.
A．Doctor and patient.
B．Chemist and patient.
C．Nurse and patient.
D．Physician and patient.
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