单项选择题

According to the passage, which of the following was the most important reason for the Aleuts' devotion to their language

A．Invention of a written version of their language.
B．Introduction of Old Slavonic for worship.
C．Disruption of oral transmission of tribal knowledge.
D．Institution of compulsory English education.
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单项选择题
Which of the following statements about the religious beliefs of the Aleuts can be inferred from the passage
A．Prior to the Russian occupation they bad no religious beliefs.
B．American traders and adventurers forced them to abandon all religious beliefs.
C．At no time in their history have the Aleuts had an organized religion.
D．The Russians forced Aleuts to become members of the Russian Orthodox Churc
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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