国标小学英语分级阅读 雨林PDF电子书下载

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What Is a Rain Forest? 4

Layers of the Rain Forest 6

The Forest Floor 8

The Understory 10

The Lower Canopy 12

The Upper Canopy 14

People of the Rain Forest 16

How the Ecosystem Works 18

Ecosy stems in Danger 20

Destruction 22

Conservation 24

Preservation:Butterflies 26

From the Author/Photographer 28

Glossary 30

Index 32

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