Hey,it has been 7 days to study liulishuo over 60 mins each day.It is difficult but important ,and if i keep this for 30 days,i will buy a small gift to reward myself.

Yesterday, I have learned somthing about excition and elvonotion of the life.There has been serveal exctition event in the history of life,One of this happened about 66 billion years ago.It caused by a astried falled into the earth,without enough sunlight ,Plants and plants eating animalsquickly died.From this,over 99 percent of the life died out.unfortunatily,some scientist believe we are going to 5th exction,main caused by human activities.So its important to protect earth now,if not we may go the way as the dinsaur .

The first plant didn't appear until around 66 billion years ago,and at the early life,life is small and miroscofe.

its time to get up, bye