The cicada who knows mathematics reads the answer Yuan Yue 1. Around "Why is the period of periodic cicada always prime?" What are the two explanations listed in this article?

2. Analysis "After calculation, entomologists found that if Leng Xia appeared once every 50 years in 1500, the survival rate of" 7-year cicada "was 7 1%, and that of"1year cicada "was 5 1%.

3. The following statement does not conform to the literal meaning is ()

A. At present, the periods of "periodic cicada" are only 13 and 17.

B. Why do periodic cicadas choose to live underground for so many years? This problem has reached a scientific conclusion.

C under normal circumstances, there is only one periodic cicada living in an area.

D. It is possible to fundamentally reveal the secret of periodic cicadas by first figuring out the principle of controlling time and their genetic mode.

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