英语 理科用 第1册PDF电子书下载

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Lesson One 1

Lesson Two 8

Lesson Three 16

Lesson Four 26

Lesson Five 38

Lesson Six 49

Lesson Seven 59

Lesson Eight 67

Lesson Nine 72

Lesson Ten 82

Lesson Eleven 93

Lesson Twelve 105

Lesson Thirteen 117

Lesson Fourteen 131

Lesson Fifteen 142

Lesson Sixteen 153

Lesson Seventeen 164

Lesson Eighteen 174

Supplementary Readings: 182

Appendix Ⅰ 189

Appendix Ⅱ 193

Appendix Ⅲ 197

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