单项选择题

A．Two students.
B．A student and a parent.
C．A teacher and a student.
D．A student and a supervisor.
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单项选择题
Relaxed throat muscles block the airway of a sleeping person and leads to his her snoring.
A．Y
B．N
C．NG
单项选择题
According to the author, research into the influence of geography and climate should______.
A．focus on some unknown aspects
B．be pursued on a larger scale
C．go much deeper
D．be carried out within a larger scope
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