单项选择题

The argument in the passage leads most naturally to which of the following conclusions

A．A low output of urinary kallikrein is a likely cause of high blood pressure in children.
B．The kallikrein-kinin system plays an important role in the regulation of blood pressure.
C．Essential hypertension may have biochemical precursors which may be useful predictors in children.
D．The failure of the body to produce sufficient amounts of kinins is the cause of essential hypertension.
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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
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
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