单项选择题

This passage mainly discusses _____.

A．causal reasoning
B．various types of reasoning
C．classification of cause
D．the causal process
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单项选择题
According to the passage, to do the effect to effect reasoning is to reason _____.
A．from cause to effect
B．from effect to cause
C．from effect to effect and on to cause
D．from effect to cause and on to another effect
单项选择题
Your refrigerator is not working and you have found that the electric power had been cut off. The power failure is a _____.
A．necessary cause
B．sufficient cause
C．contributory cause
D．none of the above
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