单项选择题

A．Nineteen million dollars.
B．Thirty-two million dollars.
C．Thirty-seven million dollars.
D．Forty-two million dollars.
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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.
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rushing
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