Part One 1
Unit One 1
Unit Two 7
Unit Three 18
Unit Four 41
Unit Five 48
Unit Six 54
Unit Seven 59
Unit Eight 71
Unit Nine 77
Unit Ten 84
Exercises from Unit One to Unit Ten 93
Key to Exercises 119
Part Two 121
Unit One 121
Unit Two 132
Unit Three 137
Unit Four 150
Unit Five 156
Unit Six 164
Unit Seven 172
Unit Eight 179
Unit Nine 191
Unit Ten 206
Exercises from Unit One to Unit Ten 213
Key to Exercises 239
Unit One 241
Part Three 241
Unit Two 248
Unit Three 258
Unit Four 268
Unit Five 280
Unit Six 287
Unit Seven 293
Unit Eight 302
Unit Nine 310
Unit Ten 323
Exercises from Unit One to Unit Ten 330
Key to Exercises 357
Unit One 359
Part Four 359
Unit Two 367
Unit Three 376
Unit Four 380
Unit Five 391
Unit Six 396
Unit Seven 401
Unit Eight 410
Unit Nine 418
Unit Ten 427
Exercises from Unit One to Unit Ten 433
Key to Exercises 459
索引 461
Ⅰ．重点语法索引 461
Ⅱ．重点词汇索引 466