课件内容：
Unit 1 Ocean Exploration
B4-U1 Text
B4-U1 Vocabulary & Grammar
B4-U1 Translation
B4-U1 Writing
B4-U1 Quiz
Unit 2 China in Transition
B4-U2 Text
B4-U2 Vocabulary & Grammar
B4-U2 Translation
B4-U2 Writing
B4-U2 Quiz
Unit 3 Job Hunting
B4-U3 Text
B4-U3 Vocabulary & Grammar
B4-U3 Translation
B4-U3 Writing
B4-U3 Quiz
Unit 4 Women Nobel Prize Winners
B4-U4 Text
B4-U4 Vocabulary & Grammar
B4-U4 Translation
B4-U4 Writing
B4-U4 Quiz
Unit 5 Cyber Language
B4-U5 Text
B4-U5 Vocabulary & Grammar
B4-U5 Translation
B4-U5 Writing
B4-U5 Quiz
Unit 6 Human-Robot Relations
B4-U6 Text
B4-U6 Vocabulary & Grammar
B4-U6 Translation
B4-U6 Writing
B4-U6 Quiz
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