英语 第2册PDF电子书下载

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Lesson 21 1

Lesson 22 12

Lesson 23 24

Lesson 24 36

Lesson 25 50

Lesson 26 64

Lesson 27 78

Lesson 28 91

Lesson 29 104

Lesson 30 121

Lesson 31 136

Lesson 32 152

Lesson 33 163

Lesson 34 179

Lesson 35 193

Lesson 36 212

Lesson 37 226

Lesson 38 243

Lesson 39 257

Lesson 40 272

Word Study：leave,beside和besides General Review 286

附录 312

Ⅰ．阅读材料 312

1．What Are Living Things Made of？ 312

2．Body Systems 314

3．What Is Disease？ 316

4．Bacteria 318

5．On Tissues in General 320

6．The Blood 322

7．The Formed Elements,or Corpuscles 324

8．Body Temperature 326

9．Functions of the Skin 328

10．Structure of the Heart 330

11．The Circulation through the Heart Muscle 333

12．The Pulse 335

13．Blood Pressure and Its Determination 337

14．The Teeth 339

15．The Spleen 341

16．The Nature of the Digestive Processes 344

17．The Liver 346

18．Location and Structure of the Kidneys 348

19．The Urine 351

20．The Body's Defenses Against Disease 353

Ⅱ．总词汇表 356

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