Problem: Alex the African grey parrot lived and was studied for 30 years before his death last year . His researchers taught him english and then tested his reasoning abilities . In one test Alex was presented with a tray on which lay a green key and a green cup .

What may be the reason Alex the African Grey was appreciated in life ?
OPTIONS:
- Researchers were able to learn much about how the mind of an older Macaw works .
- The knowledge that was gained by working with him is invaluable .
- Alex was able to teach his researchers much about birds in his 20 years of service .
- None of the above choices .

A: The knowledge that was gained by working with him is invaluable .

Problem: So we ended up ordering a freakishly large pizza from the restaurant attached to the Best Western , and watching the food Network until Mildred and I were almost half - asleep . Sunday we met up for breakfast in the aforementioned restaurant , and Mom decreed that she wanted to do more sightseeing , she just could n't wear herself out like she had the day before . So we took taxis to the Smithsonian , where we walked through the Natural History Museum and saw the Hope Diamond on display , and Mildred got scared by a mechanical fox under the elephant . ( If you get too close , it starts making noises . )

Why does the mechanical fox make noises when one gets too close ?
OPTIONS:
- The museum is try to prevent people going near exhibits because the sound would alarm security personnel
- The museum wants to be playful and give people harmless frights while attending their displays
- None of the above choices .
- The museum wants to prevent people getting too close to the exhibition

A: The museum wants to be playful and give people harmless frights while attending their displays

Problem: We clambered down slowly in sweaty thongs and walked around for a couple of minutes looking unsuccessfully for the aboriginal handprint we had been told about . The scramble out was just as awkward but we decided to continue to the next one , which was not much further along . This time the entrance was down a series of natural rock ledges .

What is the reason someone would want to see the handprint ?
OPTIONS:
- None of the above choices .
- It has historical significance .
- You can get healed of disease if you see it .
- The handprint allows a prize when you get there .

A:
It has historical significance .