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Units 4-6 Table of Contents
G R ADE Volum e 2 ILLUSTRATION 7 Sofi a Balzola. 8–9 Kenneth & Margaret Spengler. 13 Deborah Melmon. 19 John Shroades. 21 Linda Helton. 25 Susan Swan. 33 Janee Trasler. 35 Phil Wilson. 37 Erika LeBarre. 39 Susan Swan. 45 Bernard Adnet. 51 David Harrington. 53 Robin Boyer. 55 Andi Butler. 61 Hannah Wood. PHOTOGRAPHY 2–3 (bkgd) © Kevin Kelley/Stone/Getty Images. 3 © NASA. 4–5 (bkgd) © HMH. 5 © Frank Whitney/The Image Bank/ Getty Images. 11 © SuperStock, Inc./SuperStock. 15 © Richard Hutchings/PhotoEdit. 17 © Andrew Douglas/Masterfi le. 23 © Pegaz/Alamy. 26 (bkgd) © Siede Preis/Photodisc/HMH. 27 © Paul McCormich/The Image Bank/Getty Images. 29 © Ron Niebrugge/Alamy. 31 © Ariel Skelley/Photographer’s Choice RR/Getty Images. 36–37 (bkgd) © Ryan McVay/ PhotoDisc/HMH. 41 © Darrell Gulin/Photographer’s Choice/Getty Images. 42–43 (bkgd) © 1996 PhotoDisc, Inc. All rights reserved. Images provided by © 1996 Farinaz Taghavi. 43 © Zia Soleil/Stone/Getty Images. 47 © Ron Chapple/ Taxi/Getty Images. 49 (bkgd) © Dorling Kindersley/Getty Images; (foreground) © The Natural History Museum/Alamy. 56–57 (bkgd) © Ryan McVay/PhotoDisc/HMH. 57 © Jeff Cadge/The Image Bank/Getty Images. 59 (tl) © Visual & Written SL/Alamy; (bl) © Rubberball Productions; (tr) © Comstock; (br) © Ivo Roospold/Alamy. Copyright © by Houghton Miffl in Harcourt Publishing Company All rights reserved. No part of this work may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying or recording, or by any information storage and retrieval system, without the prior written permission of the copyright owner unless such copying is expressly permitted by federal copyright law. Requests for permission to make copies of any part of the work should be addressed to Houghton Miffl in Harcourt Publishing Company, Attn: Contracts, Copyrights, and Licensing, 9400 South Park Center Loop, Orlando, Florida 32819. Printed in the U.S.A. ISBN-13: 978-0-547-32740-2 ISBN-10: 0-547-32740-4 1 2 3 4 5 6 7 8 9 10 XXX 18 17 16 15 14 13 12 11 10 09 If you have received these materials as examination copies free of charge, Houghton Miffl in Harcourt Publishing Company retains title to the materials and they may not be resold. Resale of examination copies is strictly prohibited. Possession of this publication in print format does not entitle users to convert this publication, or any portion of it, into electronic format. Unit 4 Lesson 16 Going to the Moon . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Windows to the Stars . . . . . . . . . . . . . . . . . . . . . . . . 4 Lesson 17 A Trip to the City. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 A Trip to the Country . . . . . . . . . . . . . . . . . . . . . . . . 8 Lesson 18 The Egg: From Hen to Omelet. . . . . . . . . . . . . . . . .10 Squirrel’s Tasty Treat. . . . . . . . . . . . . . . . . . . . . . . . .12 Lesson 19 Making Money . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 Scientists at Work. . . . . . . . . . . . . . . . . . . . . . . . . . .16 Lesson 20 Muffi ns for Grandma . . . . . . . . . . . . . . . . . . . . . . . .18 When Warren Comes Over . . . . . . . . . . . . . . . . . . 20 Unit 5 Lesson 21 A Year in a Four-Season Forest. . . . . . . . . . . . . . . 22 Kitten Climbs a Tree . . . . . . . . . . . . . . . . . . . . . . . . 24 Lesson 22 Baby Mountain Goats. . . . . . . . . . . . . . . . . . . . . . . 26 A Nursery for Salmon. . . . . . . . . . . . . . . . . . . . . . . 28 Lesson 23 Puppy Training . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Raphael and Frisco . . . . . . . . . . . . . . . . . . . . . . . . . 32 Lesson 24 How Frogs Grow Up . . . . . . . . . . . . . . . . . . . . . . . . 34 A Line of Adorable Ducklings. . . . . . . . . . . . . . . . . 36 Lesson 25 Tree Friends. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Helping Our Wild Neighbors . . . . . . . . . . . . . . . . . 40 Unit 6 Lesson 26 An Idea for Every Book . . . . . . . . . . . . . . . . . . . . . 42 Making an Old Bike New . . . . . . . . . . . . . . . . . . . . 44 Lesson 27 School and Success . . . . . . . . . . . . . . . . . . . . . . . . . 46 It’s Smart to Be Curious . . . . . . . . . . . . . . . . . . . . . 48 Lesson 28 The Sailboat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 The Tryout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Lesson 29 The Case of the Missing Corn . . . . . . . . . . . . . . . . 54 Trials and Juries . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Lesson 30 Choose the Sport That’s Best for You . . . . . . . . . . 58 Thrills at the Game . . . . . . . . . . . . . . . . . . . . . . . . . 60