—When_______ to work as a doctor, Miss Hu?

—Three years ago.

A. do you begin B. will you begin

C. are you beginning D. did you begin

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Your nose has many important jobs, and is always busy.

Smelling

Smelling helps you gather information about the world around you. A good scent (氣體),like flowers, brings you pleasure. A bad scent, like smoke or sour milk, warns you of danger. Most things around you release scent particles (微粒) into the air. These invisible chemicals enter the nose when you breathe. Nerves in the nose send information to the brain to identify a smell. You are able to recognize thousands of smells.

Breathing

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Tasting

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