阅读下面短文，从短文后的选项中，选出可以填入空白处的最佳选项。选项中有一项为多余选项。
   People started to study the weather very early.（1）

D

D

.Some are still useful.Let's have a look!
   Watch the sky
   Look at clouds.（2）

E

E

How the clouds move （移动） also means different （不同的） weather.
  Usually，white and high （高） clouds mean （意味着） good weather.Black clouds mean bad weather.（3）

A

A

Your parents may tell you， "Red sky in the morning，don't go out.Red sky at night，walk for a long time." Well，this is quite right.
   Watch animals
   Look at the birds （鸟）.Usually，they fly very high in the sky.（4）

C

C

Sometimes the birds fly very low （低） in the sky.And this means bad weather.Birds also get very quiet before it rains.
   Look at the turtles （海龟）.（5）

F

F

.You can see them on the road one to two days before it rains.Look at the cows.Sometimes，they will stay together and keep quiet，because bad weather is on the way.
A.Look at the red sky.
B.Look at the flowers.
C.And this means good weather.
D.They used many different ways.
E.Different kinds of clouds mean different weather.
F.Before bad weather comes，they'll climb to a high place.