单项选择题

Over a third of the population was estimated to have no ______ to the health service.

A．assessment
B．assignment
C．exception
D．access
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单项选择题
Every chemical change either results from energy being used to produce the change, or causes energy to be ______ in some form.
A．given off
B．put out
C．set off .
D．used up
单项选择题
Frequently single-parent children ______ some of the functions that the absent adult in the house would have served.
A．take off
B．take after
C．take in
D．take on
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