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【单选题】

Laudenslager's experiment showed that the immune system of those rats who could turn off the electricity ________.
A．was strengthened

B．was not affected
C．was altered
D．was weakened
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根据网考网移动考试中心的统计，该试题：

9%的考友选择了A选项

87%的考友选择了B选项

2%的考友选择了C选项

2%的考友选择了D选项

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