单项选择题

A．In a restaurant.
B．In a supermarket.
C．At an office.
D．At home.
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单项选择题
A．The heat is supplied by human bodies only.B．The heat is supplied by both human bodies and conventional fuel.C．The heat is supplied by both human bodies and other heat-emitting objects.D．The heat is supplied by human bodies, other heat-emitting objects, and conventional fuel.
A．The heat is supplied by human bodies only.
B．The heat is supplied by both human bodies and conventional fuel.
C．The heat is supplied by both human bodies and other heat-emitting objects.
D．The heat is supplied by human bodies, other heat-emitting objects, and conventional fuel.
单项选择题
A．To play games with them.B．To send them to the hospital.C．To make them aware of its harmfulness.D．To help solve their psychological problem.
A．To play games with them.
B．To send them to the hospital.
C．To make them aware of its harmfulness.
D．To help solve their psychological problem.
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