根据句意及汉语的提示,补全单词.

1. He is _____ (高的) of the two boys.

2. Which desert is_____ (大的) in the world?

3. Things have gone from bad to _____ (更差).

4. The trees can prevent the wind from _____ (刮) the earth away.

5.  He jumped twice as _____ (高) as his friend.

简述有机食品与其他食品的区别。