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Answer Key
Nature and the Environment
Unit 1 Hibernation
A. New Words
1. shelter 2. weather 3. climate
4. include 5. underground 6. hibernate
B. Understanding the Context
1. (c) 2. (a)
C. Focus on Details
1. shelter 2. include
3. hibernate 4. climates
D. True or False
1. F 2. T 3. F
4. T 5. T
Unit 2 Falling Leaves
A. New Words
1. sense 2. Chlorophyll 3. survive
4. fade 5. reveal 6. migrate
B. Understanding the Context
1. (c) 2. (b)
C. Focus on Details
1. sense 2. Chlorophyll
3. reveals 4. migrate
D. True or False
1. F 2. T 3. T
4. F 5. T
Unit 3 How the Dinosaurs Disappeared
A. New Words
1. dinosaur 2. mystery 3. exist
4. atmosphere 5. meteor 6. earthquake

1. (2) 2. (4) 3. (3)
4. (1) 5. (5)
Science and Technology
Unit 6 Who Invented That?
A. New Words
1. unusual 2. invention 3. incredible
4. portable 5. concentrate 6. waist
B. Understanding the Context
1. (d) 2. (a)
C. Focus on Details
1. inventions 2. portable
3. waist 4. unusual
Answer Key
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D. True or False
1. T 2. T 3. T
4. F 5. F
Unit 7 The White Noise Machine
A. New Words
1. contest 2. reduce 3. microphone
4. invisible 5. frequency 6. powerful
B. Understanding the Context
1. (d) 2. (a)
C. Focus on Details
1. contest 2. invisible
3. microphone 4. frequency
D. True or False
1. F 2. F 3. T
4. F 5. T
Unit 8 Inches and Centimeters

1. encourage 2. experiments
3. impressed 4. confidence
D. True or False
1. T 2. F 3. T
4. T 5. F
Art and Culture
Unit 11 On Stage!
A. New Words
1. death 2. scene 3. audience
4. theater 5. tragedy 6. enthusiasm
B. Understanding the Context
1. (b) 2. (d)
C. Focus on Details
1. Death 2. Tragedy
3. audience 4. enthusiasm
D. Summary
1. (1) 2. (5) 3. (2)
4. (3) 5. (4)
Unit 12 A Famous Portrait
A. New Words
1. model 2. appeal 3. landscape
4. Apparently 5. portrait 6. arrogant
B. Understanding the Context
1. (a) 2. (d)
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Answer Key
C. Focus on Details
1. portrait 2. landscape
3. arrogant 4. appeal
D. True or False

B. Understanding the Context
1. (b) 2. (a)
C. Focus on Details
1. wedding 2. married
3. department stores 4. present
D. True or False
1. T 2. F 3. T
4. F 5. F
Leisure and Entertainment
Unit 16 Collecting Stamps
A. New Words
1. stamp 2. exchange 3. envelope
4. inexpensive 5. endangered 6. various
B. Understanding the Context
1. (a) 2. (d)
C. Focus on Details
1. inexpensive 2. envelope
3. endangered 4. exchange
D. Summary
1. (2) 2. (5) 3. (4)
4. (3) 5. (1)
Unit 17 Rock, Paper, Scissors
A. New Words
1. scissors 2. fist 3. palm
4. finger 5. championship 6. defeat
B. Understanding the Context
1. (c) 2. (d)
C. Focus on Details
1. scissors 2. fist
3. defeat 4. championship

1. audition 2. script 3. princess
4. pirate 5. sword 6. postive
B. Understanding the Context
1. (c) 2. (a)
C. Focus on Details
1. audition 2. script
3. positive 4. pirate
D. True or False
1. F 2. F 3. T
4. T 5. F
School and Family
Unit 21 Add, Subtract, Multiply, and
Divide
A. New Words
1. subtract 2. multiply 3. require
4. huge 5. apply 6. imagine
B. Understanding the Context
1. (c) 2. (a)
C. Focus on Details
1. subtract 2. apply
3. imagine 4. huge
D. Summary
1. (2) 2. (3) 3. (1)
4. (5) 5. (4)
Unit 22 I Spy
A. New Words
1. location 2. mistake 3. object
4. manners 5. apologize 6. respect
B. Understanding the Context
1. (a) 2. (d)

1. F 2. T 3. F
4. F 5. T
Unit 25 My Favorite Teacher
A. New Words
1. beard 2. demonstrate 3. gestures
4. wastebasket 5. guilty 6. active
B. Understanding the Context
1. (b) 2. (c)
C. Focus on Details
1. beard 2. active
3. wastebasket 4. guilty
D. Summary
1. (1) 2. (5) 3. (3)
4. (2) 5. (4)
People and Work
Unit 26 Meet Debra
A. New Words
1. goodbye 2. adventure 3. shy
4. remind 5. childhood 6. interests
B. Understanding the Context
1. (c) 2. (c)
C. Focus on Details
1. adventure 2. childhood
3. remind 4. interests
D. True or False
1. F 2. F 3. F
4. F 5. T
Unit 27 What’s in a Name?
A. New Words
1. nickname 2. driver’s license 3. boxer