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Forests are the lungs of the earth. Without them, it cannot breathe. It needs its forests to remove carbon dioxide from the air and to make oxygen. In many countries, such as New Zealand, Canada, and Brazil, forests were cut down to1. (提供)wood to build houses. Cutting down trees is h2. to human beings,animals and plants. Many young volunteers around the world are working in their holidays to plant new trees to replace them.

These young men and women f3. many difficulties when they plant new trees. The weather may be very hot and dry or may be very cold and wet. Tree 4.(种植者) are changing the world. They plant different types of trees so that birds and animals can live in the forests. They b5.that in 50 years their little trees will become beautiful forests.

九年级英语单词填空中等难度题

少年,再来一题如何?
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