What the author discussed in the previous section is most probably about ______. Your refrigerator is not working and you have

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问题 What the author discussed in the previous section is most probably about ______.
Your refrigerator is not working and you have found that the electric power has been cut off. The power failure is a ______.

选项 A、necessary cause
B、sufficient cause
C、contributory cause
D、none of them

答案B

解析 根据“a sufficient cause”的定义。因为仅“断电”一项原因,足以使“冰箱”停止工作。
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