题目:
The passage suggests that Twigg believes that rats could not have spread the Black Death unless which of the following were true?
选项:
A、The rats escaped from ships that had been in Asia.
B、The rats were immune to the diseases that they carried.
C、The rats population was larger in medieval Europe than Twigg believes it actually was.
D、The rats population primarily infested densely populated areas.
E、The rats interacted with other animals that Twigg believes could have carried plague.
答案:
C