The two missing pieces happened to be found in______.

A．Studying income reveals nothing about the standard of living.
B．Height and income combined reveal more about the standard of living.
C．The standard of living cannot be truly measured.
D．Economists do not agree on what the standard of living means.

A．Americans generally receive poorer medical care than those people in the Scandinavian countries
B．some Americans have inadequate access to medical care and nutrition
C．the living standards in those Scandinavian countries have greatly improved
D．the living standard in America has declined with shorter average