【单选题】----How amazing, Sara! You are used to going to bed early and getting up early these days. ----_______ And I hope you can lead such a healthy life, too.
【简答题】????We do?? not know how the first fire was(1).Early fires on the earth were certainly caused by nature,not by Man,some were caused by lightning in a storm;(2),perhaps,by the hot material which came o...