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     ǰ  Why I Sneeze, Shiver, Hiccup, & Yawn (Let's-Read-and-Find-Out Science, Stage 2, ۹) (ǰ)

  å:Why I Sneeze, Shiver, Hiccup, & Yawn (Let's-Read-and-Find-Out Science, Stage 2, ۹) (ǰ)
  :Melvin Berger
  ǻ : HarperTrophy
  :32
  ISBN:9780064451932
   : NO
  Һڰ:7,800
  ǸŰ:ݹ
  :0
   : 忬 - ġ, ʵб г (6~10)
   :
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: õմϴ!   ۾: wjychoi
   YOUR REFLEXES  ȸ: 336 / õ : 72
å ִµ ħ ϴ ׿.  ˸鼭 å ׸ 鼭 ǥ ϸ Ĵٺ׿. ׷ ϰ ø äⰡ ´ٰ . å ׸ Ǿ ֳ׿.
<Why You Sneeze?>
1. Dirt goes in mouth or nose.
2. Brain gets message and sends it to spinal cord.
3. Spinal cord gets message and sends it to diaphragm and belly muscles.
4. Muscles contract.
5. Air is forced out of lungs and into nose and mouth.
6. You Sneeze!

 2011 12 08 04:48:57

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