题目内容：

阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

The Amazon is key to the health of the entire planet. It is the largest rainforest in the world, 1. (rough) half the size of the United States. Statistics show that nearly 20% of the oxygen 2. (produce) by the Earth’s land comes from the Amazon rainforest. It also puts an enormous amount of water into the atmosphere at a time 3. cities are drying up. The Amazon is sucking in carbon and greenhouse gases while slowing the rising temperatures. 4. it’s now burning at a record rate - with images from space 5. (show) the smoke covering much of Brazil.

It’s not the only major forest in danger Nearly half of the world’s forests that 6. (stand) when humans started farming are now gone. The chief reason is the expansion 7. agriculture into forested areas. In Brazil it’s cattle ranching, soy production and logging, according to Nigel Sizer, tropical forest ecologist. “It is responsible for 80% to 90% of 8. loss of tropical forests around the world.” Environmental groups say these activities can 9. (slow) in a much more sustainable way.

However, you can help reforest parts of the world through the Rainforest Trust and Rainforest Alliance. The Rainforest Trust allows you to restrict your donations to a specific project. The Rainforest Alliance says 100% of your 10. (contribute) will help stop deforestation in Brazil right now.