2.科普知识
What a fine day! The sun _1_ and everything _2_ bright. Can you felt _3_
when you stand in the sun? The sun gives heat from far away. It is about one
hundred and fifty million kilometers _4_. The sun looks small because it is far
from us, but _5_ it’s very huge.
The earth moves around the sun. It _6_ one year from the earth to go
around the sun. And at the same time the earth _7_ is spinning(自转) around once every twenty-four hours.
The sun gives us light. It keeps us _8_ . It makes thing _9_. Plants,
animals and people need the sun. We can’t live _10_ the sun.