问题描述：
谢谢各位了！！
问题解答：
unit 1 how i got smart
unit 2 the titanic riddle
unit 3 the sense of wonder
unit 4 college pressures
unit 5 the abcs of the u.s.a.
unit 6 every 23 minutes
unit 7 so what's so bad about being so-so?
unit 8 the highs of low technology
unit 9 space politics
unit 10 plain talk about handling stress
Unit1 Parents
Unit2 Coincidence
Unit3 Marriage
Unit4 Stress
Unit5 Youth
Unit6 The Natural World
Unit7 Courage
Unit8 Left-handedness
Unit9 The Business World
Unit10 Humor
Unit11 The Cinema
Unit12 The Single Currency
Unit13 The Universe
Unit14 Genetic Engineering
Unit15 Women
Unit16 Dealing with a Crisis
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