Directions: In this part, you will have 15 minutes to go over the passage quickly　and answer the questions on theAnswer Sheet。

　　For questions I - 4, mark

　　Y( for YES) if the statement agrees with the information given in the passage;

　　N( for NO) if the statement contradicts the information given in the passage;

　　NG( for NOT GIVEN) if the information is not given in the passage。

　　For questions 5-10, complete the sentences with the information given in the　passage。

　　Rain forests

　　Tropical rainforests are the most diverse ecosystem (生態(tài)系統(tǒng)) on Earth, and　also the oldest. Today, tropical rainforests cover only 6 percent of the Earth's ground　surface, but they are home to over half of the planet’s plant and animal species。

　　What Is a Rainforest?

　　Generally speaking, a rainforest is an environment that receives high rainfall and　is dominated by tall trees. A wide range of ecosystems fall into this category, of　course. But most of the time when people talk about rainforests, they mean the　tropical rainforests located near the equator。

　　These forests receive between 160 and 400 inches of rain per year. The total　annual rainfall is spread pretty evenly throughout the year, and the temperature rarely　dips below 60 degrees Fahrenheit。

　　This steady climate is due to the position of rainforests on the globe. Because of　the orientation of the Earth's axis, the Northern and Southern hemispheres each spend　part of the year tilted away from the sun. Since rainforests are at the middle of the　globe, located near the equator, they arc not especially affected by this change. They　receive nearly the same amount of sunlight, and therefore heat, all year. Consequently,　the weather in these regions remains fairly constant。

　　The consistently wet, warm weather and ample sunlight give plant life　everything it needs to thrive. Trees have the resources to grow to tremendous heights,　and they live for hundreds, even thousands, of years. These giants, which reach 60 to