1 . Which one is different?  

  • A. Parents and children
  • B. Teacher and students
  • C. Police and criminals
  • D. Trainer and trainee
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2 .  Which one is different?  

  • A. Penicillin
  • B. SARS
  • C. HIV
  • D. Ebola
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3 . Which one is different?

  • A. Bat
  • B. Dolphin
  • C. Kangaroo
  • D. Snake
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