请教几道补充材料上的题.谢谢!

jacy

286.
when people predict that a certain result will not take place unless a centain action is taken. They believe that they have learned that the prediction is correct when the action is taken and the result occurs. On reflection, however, it often becomes clear that the result admits of more than one interpretation.
Which of the following , if true, best supports the claims above?
A judging the success of an action requires specifying the goal of the action
B judging which action to take after a prediction is made requires knowing about other actions that have been successful in similar past situations.
C learning whether a certain predictive strategy is good requires knowing the result of using that strategy through several trials.
D distinguishing a correct prediction and effective action from an incorrect prediction and ineffective action is often impossible.
E making a successful prediction requires knowing the facts about the context of that prediction.
Key:d.
How to support the passage?
238.
a newly discovered disease is thought to be caused by a certain bacterium. However, recently released data notes that the bacterium thrives in the presence of a certain virus, implying that it is actually the virus that causes the new disease,
which of the following pieces of evidence would most support the data’s implication>
B the virus has been shown to aid the growth of bacterium, a process which often leads to the onset of the disease.
C the virus alone has been observed in many cases of the disease.

The correct answer is c ,but I think b is better.
C only means some occasions,not all of them.but b describes a common condition, so I think b is better,why?

214.
samples from a ceramic vase found at a tomb in sicily prove that the vase was manufactured in Greece. Since the occupant of the tomb died during the reign of a Sicilian ruler tho lived 2700 years ago, the location of the vase indicates that there was trade between Sicily and     Greece 2700 years ago.
Which of the following is an assumption on which the argument depends?
B sicilian clay that was used in the  manufacture of pottery during the ruler’s reign bore little resemblance to Greek clay used to manufacture pottery at that time.
D the vase that was found at the Sicilian tomb was not placed there many generations later by descendants of the occupant of the tomb.

The answer is d, but I think b is also right.
B not+weaken, exclude the possibility that the vase was manufactured in Sicily. So b is also correct, right?

welcome to discuss,
and thanks a lot!!

shany

1. I am not sure the title is intact.According to D, if we are unable to identify the right or wrong prediction and action, there must be different interpretations consistent with the result.This supports the conclusion that the result admits of more than one interpretation. In my opinion, it is a paraphrase of 事实性加强.
2. B undermines the conclusion. It confirms that the bacterium is a direct reason that results in the disease.As for C, if it could give the argument more strength, whethor the strength is conclusive or not, it surely is a support.
3. B is wrong, because there is not a possibility that the vase was manufactured in Sicily. The fact is clarified in the first sentence. D eliminates an alternative explanation for the finding, and thus is a good assumption.

jacy

thank u very much!
i got it!
although i don't understand the first one very well, i will try to do so .