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前言 1
LESSON 7 The Trial 1
LESSON 8 Charles Darwin 29
LESSON 9The Language of the Bees 52
LESSON 10The Sixth Diamond 73
LESSON 11 A Speech By Norman Bethune 100
LESSON 12From the Jaws of Death 122
综合练习（一） 145
综合练习（二） 160
参考答案 177