Here’s the corrected version of the text following your guidelines:
The title of this story is "Hippo, the Most Dangerous Animal in Africa."
Hippos live in Africa, and they love water.
People think hippos are cute and harmless, but they are the deadliest animal in Africa the Africa.
Hippos are very massive and can run 100 meters 100m in 12 seconds, so hippos can run faster than the average person people's average.
Also, they are aggressive agressive animals. Male hippos get more aggressive when their territories are invaded.
Female hippos get more aggressive when they sense a threat for to their babies.
I think this book is interesting because I learned information about hippos.
Score: B+
팁)
"The"는 "deadliest animal in Africa" 앞에 추가해야 합니다.
"100 meters"는 더 정확한 표현입니다.
"The average person"이 더 자연스럽습니다.
"Aggressive"는 올바른 철자입니다.
"Sense a threat to"가 정확한 표현입니다.
"Information about"는 "learned about" 대신 "learned information"이 더 자연스럽습니다.