龙文教育1对1 Vocabulary and Grammar
Directions: Complete the following passage by using the words in the box.
Each word can only be used once. Note that there is one word more than you need.
A. disappearing B. massive C. releasing
D. contribute E. degrade
F. eventually G ecosystems H. increasingly I. essential J. tourism
Every year, 20 million hectares of rainforest—an area the size of England, Wales and Scotland combined—are cut down, 1 millions of tons of carbon emissions into the atmosphere.
Without action now, many of the world's tropical forests will be lost by this century's end. With these forests 2 . we will lose important species, natural resources and local livelihoods, as well as the opportunity to slow climate change.
Tropical forests cover only 12 percent of the planet but are home to more than one-half of the l Earth's known plants and animal species. At the current rate of deforestation, tropical rainforests would virtually disappear as functioning 3 within 100 years. Deforestation would also
4 ___ important natural resources, just like supplies of clean fresh water. In addition, the 5 burning of forests can lead to severe air pollution both locally and thousands of miles away.
South American forests are home to the greatest plant biodiversity in the world, and are the source of 6 pharmaceutical (药用的) parts. Up to 50 percent of pharmaceuticals on the market today have an origin in natural products, and 42 percent of the top 25 selling drugs worldwide come from natural products.
Forests provide recreation for an 7 wealthy and urbanized population. For example, 3.5 million people visited Brazil's 150 conservation areas between 1991 and 1999, helping fuel a five-fold increase in 8 for the country. According to Sohngen and Bach, efforts to reduce global deforestation could 9 to an increasing gain of 76 billion tons of carbon and just over 1 billion
acres in additional forests.
Keys:1. C 2. A 3. G 4. E 5. B 6. I 7. H 8. J 9. D
百度搜索“77cn”或“免费范文网”即可找到本站免费阅读全部范文。收藏本站方便下次阅读，免费范文网，提供经典小说综合文库高三一模 十选九 1在线全文阅读。
相关推荐：