摘要：1 People used to think the earth was flat 人们曾经认为地球是平的。 2 People used to believe the earth was flat 人们一度认为地球是...

1.People used to think the earth was flat.人们曾经认为地球是平的。

2.People used to believe the earth was flat.人们一度认为地球是平的。

3.There were low banks of earth between the rice fields.稻田之间有低矮的田埂。

4.Water covers a large proportion of the earth's surface.水覆盖了地球表面的大部分。