Unit 1 1
Unit 2 11
Unit 3 20
Unit 4 30
Unit 5 42
Unit 6 52
Unit7 64
Unit 8 75
Unit 9 83
Unit 10 94
Unit 11 103
Unit 12 112
Unit 13 123
Unit 14 132
Unit 15 143
Unit 16 153
Unit 17 162
Unit 18 172
Unit 19 185
Unit 20 195
Unit 21 207
Unit 22 217
Unit 23 228
Unit 24 240
Unit 25 251
Unit 26 263
Unit 27 274
Unit 28 287
Unit 29 299
Unit 30 315
Unit 31 322
Unit 32 329
答案 336
Section E：Suggested Answers to Exercise 2 336