听力原文：

In many parts of the world, there is a problem: plenty of forests are being cut down, especially in Africa. That makes animals lose their home, leads to climate change, and causes farmland to turn into desert. The earth’s temperature keeps rising. The greenhouse effect has become a problem to be solved all over the world. Now people are coming to realize the importance of the environment. Laws are being made to deal with air, water and noise pollution. 

Question: In which part of the world are trees cut down most heavily?

参考答案：

Africa.