题目内容：

We all know that foods will easily go bad if they get too warm. So we usually put them into our fridges to keep cool in hot weather. But can you make it without fridges?

In 1995, Abba, a teacher from Nigeria, found a cool way. His invention was called Pot-in-Pot Cooling System.

It uses two clay pots (陶罐). There is a smaller pot inside a larger one. The space between the two pots is filled with wet sand. Fruit, vegetables or drinks can be put into the smaller pot. A wet cloth covers the whole cooling system. Some foods can be kept fresh for several weeks in it.

Abba built five thousand pot-in-pot systems for the villagers in his hometown. Then people all over the country began using the invention. Soon it became popular with farmers in other African countries.

In 2000, Abba got a prize --- the Rolex Award. If you are trying to do something to improve human life, you may have the chance to get this prize.

1.Who is Abba?

2.Where should we put fruit and drinks in the Pot-in-Pot Cooling System ?

3.What can farmers use Abba’s invention to do?

4.How many pot-in-pot systems did Abba build for the villagers?

5.From the passage, how can we have the chance to get this kind of prize like Abba?