求英语语法高手来帮我看下这篇 被我TUTOR 罚重写3次了!我真的不想有 第四次!

求英语语法高手来帮我看下这篇 被我TUTOR 罚重写3次了!我真的不想有 第四次!
According to the reading passage,there are the three main theories about extinction of mammoths.
Firstly,the reading passage mentioned about the Clovis people hunted mammoths and lead to their extinction about the 11,000 years ago.However,this professor did not think it is true in the lecture.He thinks that it is impossible for human killing off these mammoths.Mammoths had thick skin and thick layers.It also had a great appearance.The most important is that mammoths’ population is 10 times of the human.Thus,why should human hunted those Giant instead of other smaller animals.Professor thought this theory can not be true.
Secondly,we can learn from the reading passage that climatic changes killed off these mammoths during the ice age.Mammoths were killed by the climatic because it was getting warmer and warmer.However,the professor seems to doubt this theory in the listening passage.He thought mammoths endured more severe climate changes,why did this climate change kill them?Other animals like African and Indian elephants managed to survive this climate change without any problems.
Lastly,the reading passage supported this theory that mammoths were destroyed by diseases brought by humans from the old world.But the professor thought humans killed off mammoths indirectly by disease.But he also thought this is an interesting theory.Later on scientists examined the remains of many dead mammoths,did not found a sign of ant infectious diseases.Thus,the mammoths should not be killed by the diseases.

错的多：1 the three main 去the
2 the Clovis people mentioned in the reading passage hunted mammoths ,which led to --
3.it was true
4.He thought that it was impossible for humans to kill off these mammoths ,which had thick skin and thick layers and also a great appearance.
5.The most important thing was that mammoths’ population was 10 times that of the humans.
6.Thus,the humans couldn't hunt those Giant instead of other smaller animals
7Professor thought this theory couldn't be true
第一段改完啦,12点了,困了.bye
再问： 兄弟 求 第二三段！