求助PREP总统中毒的题目~太不好理解了，谢谢了先~

jyw0411lsq

31.(31265-!-item-!-188;#058&006121)

The symptoms that United States President Zachary Taylor began showing five days before his death are consistent with arsenic poisoning.Recent examination of Taylor's bones, however, revealed levels of arsenic comparable to those found in the bones of Taylor's contemporaries.These levels are much lower than the levels of arsenic that remain in the bones of arsenic poisoning victims who live for more than a day after ingesting a lethal dose of the poison.

Which of the following is most strongly supported by the statements given?

(A) The symptoms that Taylor began showing five days before his death are consistent with poisoning other than arsenic poisoning.

(B) Taylor's death was not the result of any kind of poisoning.

(C) The symptoms that Taylor began showing five days before his death were not caused by a lethal dose of arsenic.

(D) The symptoms that Taylor began showing five days before his death grew more severe each day.

(E) It is unusual for a person who has ingested a lethal dose of arsenic to survive for more than a day.答案是C,
我就是没有搞清taylor 和他contemporaries在中毒level什么关系，求牛牛解释~
还有D为什么错了，C为什么对~谢谢了，这道题目我搜索过，没有人问过

sdcar2010

This is a reference question so the correct answer MUST BE TRUE.

C is a must-be-true answer because if the analysis has proved that the arsenic level in his bones is much less than the lethal dose, then the symptoms he displayed five days before his death was not caused by a lethal dose of arsenic.

D is wrong because nowhere in the stimulus can you find what D says.

MUST BE TRUE is the easiest question to solve since the correct answer has been stated in the stimulus.