单选题
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
【正确答案】
C
【答案解析】
[精解] 文中所述的实验中，没有证明[A]、[B]、[D]，只有[C]提到，控制环境因素，才能研究遗传与salt对高血压的影响，答案是C。
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