单项选择题

How many sleeping positions are explained in the passage

A．3.
B．4.
C．5.
D．6.
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单项选择题
A person who goes to sleep on his back might be______.
A．a careful person
B．a shy person
C．a stubborn person
D．a confident person
单项选择题
A．techniqueB．technicalC．technologyD．technician
A．technique
B．technical
C．technology
D．technician
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