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A．terrible
B．possible
C．enjoyable
D．profitable
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单项选择题In the experiments, ______.

A．there was an increase in the human consumption of salt
B．salt -eaters have bad health conditions
C．the environment was strictly monitored
D．high -blood pressure was easier put under control

单项选择题The study of the effects of salt on high blood pressure was carried out ______.

A．because members of the same family tend to use similar amounts of salt
B．to explore the long - term use of a sodium - based substance
C．because it was proved that salt caused high blood pressure
D．because of the availability of chemically pure salt and its derivatives