目录 Syllabus Unit 01 She Saved Thousands of Lives Unit 02 Colors Can Affect Moods Unit 03 Sharks Seem Big and Scary Unit 04 Hackers Create Big Problems Unit 05 They Were Expensive a Month Ago! Unit 06 Chameleons Can Change Colors Unit 07 A Black Hole's Gravity Is Strong Unit 08 Laughter Is the Best Medicine Unit 09 They Both Use Bright Colors Unit 10 Vinegar Is a Special Food Review Test Ⅰ Review Test Ⅱ Review Test Ⅲ Audio Script Answer Key
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