单项选择题

The author is primarily concerned with______.

A．questioning the assumption behind certain experiments involving children under the age of 15
B．describing the new scientific findings about high blood pressure and suggesting some implications
C．describing two different methods for studying the causes of high blood pressure
D．revealing a discrepancy between the findings of epidemiological studies and laboratory studies on essential hypertension
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单项选择题
The evidence that a child with blood pressure higher or lower than the norm would tend to retain the same blood pressure pattern with increasing age is introduced by the author in order to______.
A．suggest that essential hypertension may have biochemical causes
B．show that high blood pressure can be detected in children under the age of 15
C．provide evidence that factors affecting blood pressure are already present in children
D．propose that increased screening of children for high blood pressure should be undertaken
单项选择题
The author refers to the somewhat lower urinary kallikrein levels in black children in order to______.
A．support the thesis that kallikrein levels are inversely related to blood pressure
B．highlight the special health problems involved in treating populations with high concentrations of black children
C．offer a causal explanation for the difference in urinary kallikrein levels between black and white children
D．suggest that further study needs to be done on the problem of high blood pressure among black adults
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