Water had also appeared on other planets like Mars. Unlike the earth, it had disappeared later. Next, green plants began to grow on land. Dinosaurs laid eggs and existed on the earth for… However, 65 million years ago the age of the dinosaurs ended. Finally about 2.6 million years ago some small clever animals now with hands and feet, appeared and spread all over the earth.

1. Vi 不及物动词的用法

出现

消失

存在

结束

蔓延