A) one without which it is impossible for the effect to occur
B) one of the causes that can produce the effect
C) one that is enough to make the effect occur
D) none of them
4. Your refrigerator is not working and you have found that the electric power has been cut off.
The power failure is a ____.
A) necessary cause B) sufficient cause
C) contributory cause D) none of them
5. This passage mainly discusses ____.
A) causal reasoning B) classification of cause
C) various types of reasoning D) the causal process
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