Unit One Scientific Research(Ⅰ) 1
Part A 2
Part B 8
Part C 10
Unit Two Scientific Research(Ⅱ) 25
Part A 27
Part B 33
Part C 35
Unit Three Safety(Ⅰ) 49
Part A 51
Part B 57
Part C 59
Unit Four Safety(Ⅱ) 73
Part A 74
Part B 81
Part C 82
Unit Five Gap (Ⅰ) 97
Part A 99
Part B 105
Part C 107
Unit Six Gap(Ⅱ) 123
Part A 125
Part B 131
Part C 133
Unit Seven Gender(Ⅰ) 147
Part A 149
Part B 155
Part C 157
Unit Eight Gender(Ⅱ) 171
Part A 174
Part B 179
Part C 182
Unit Nine Entertainment(Ⅰ) 197
Part A 199
Part B 204
Part C 207
Unit Ten Entertainment(Ⅱ) 219
Part A 221
Part B 227
Part C 228
Unit Eleven Education(Ⅰ) 241
Part A 242
Part B 248
Part C 250
Unit Twelve Education(Ⅱ) 263
Part A 265
Part B 271
Part C 273
Key to Exercises 287