5(great) than light.Since the late 1960s, the Big Bang theory 6 (be)the main explanation for the birth of our universe.Because 7 (physics) have not yet found a convincingtheory that explains how gravity operates, they are unable8 (find) theories as to what happened after the BigBang....
Two theories for these FRBs are relatively mundane. One theory proposes that FRBs are generated by powerful magnetars — highly magnetized, fast-rotating superdense stars. A second theory suggests that a FRB is a created by an especially exotic type of black hole. ...
现在有五个说法:弗洛伊德认为梦揭示了人们心中最深处最私密的欲望;有人认为做梦能帮助我们解决睡觉前正在思考的问题;有人说人们做梦是为了模拟练习一些生存技能,比如说被怪兽追;也有人说做梦是大脑细胞通过练习强化之间的练习。更现代的说法是做梦时,大脑就像磁盘清理一样储存有用的,删去没用的记忆,丢到“回收站”里...