Grammar, Usage / Have vs has? [4]

Hi, everybody. I just noticed form the Sesame Street that when we describe different parts of body, people tend to say " I have got a pair of eyes" rather than " I have a pair of eyes". Is there any difference between the two? And is it right or natural for us to say "I have". Just want to ensure I say it right and teach it right. Thanks a lot.

Undergraduate / Common App - The catastrophic Japan Earthquake [9]

It's only in Japan because Japan has actually built the infrastructure required by putting thousands of seismographs around the country to detect early seismic waves (P-waves) that come before the main shaking (S-waves).

Until other countries install the sensors, they can't have a useful earthquake early-warning system.

Undergraduate / "We're having chickpea stew for dinner!" - Brown RD Supplement [5]

i dont get what supplement essays are
it says to do it for if youre applying for engineering and liberal medicine and other things but do you have to choose one?
does anyone have the questions for the supplement essays?
what if i dont want to major in any of the things they tell me to write a supplement for?