A subject in which there has been lots of interest recently is the acquisition of language. 'Normal'

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20. National income per head is an indicator of the
standard of living. However, this measure is
necessarily a rough one. For instance, it cannot take
into account new and better products such as
television, man-made fibres, faster flight, long-
playing records or the lowly plastic bucket; nor does
it indicate changes in the distribution of income
between rich-and-poor; nor in the length of the
working week. Data of national income per head may
also conceal important changes in the "quality of life"
as for example, in our physical environment. This is
affected by such things are traffic congestion, noise,
water and air pollution.
It is clear from the passage that in assessing
the standard of living in a country, ______. 
A) the quality of life should be taken into
consideration 
B) the income of the rich is of major importance 
C) the state of the poor should be disregarded 
D) the prices of goods and services need to be stable
E) no importance should be attached to questions of
pollution 
21. National income per head is an indicator of the
standard of living. However, this measure is
necessarily a rough one. For instance, it cannot take
into account new and better products such as
television, man-made fibres, faster flight, long-
playing records or the lowly plastic bucket; nor does
it indicate changes in the distribution of income
between rich-and-poor; nor in the length of the
working week. Data of national income per head may
also conceal important changes in the "quality of life"
as for example, in our physical environment. This is
affected by such things are traffic congestion, noise,
water and air pollution.