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UNIT 1 The Olympics 1
UNIT 2 Biggest,Longest,Widest 11
UNIT 3 Buying and Selling 21
UNIT 4 Stay Healthy 31
UNIT 5 Great People 41
UNIT 6 Accidents! 51
Vocabulary（Ⅰ） 61
Vocabulary（Ⅱ） 67
Structures and Expressions 73
Irregular Verbs 76