Do you know yourself？ There is something surprising inside you. Let’s take a quiz.

1. How long does food take to go from your mouth to your stomach？

A. About 2-3 seconds B. About 6-7 seconds

C. About 2 minutes D. About 5 minutes

2. When we breathe（呼吸）， we .

A. use two nostrils（鼻孔） at the same time.

B. Alternate（交替） between our left and right nostrils.

3. People have the same number of neck bones（骨頭） as a/an .

A. monkey B. elephant C. giraffe D. bear

4. Your body grows as you get older. But which part of you grows only a little bit？

A. Eyes B. Nose C. Mouth D. Ears