二、听短对话,选择正确的答案。每段对话听两遍。(每小题1.5分,共7.5分)
() 6. How big is the Amazon Rainforest?
A. About 20 million square kilometres.
B. Around 50 million square kilometres.
C. About 5.5 million square kilometres.
() 7. How deep is the deepest part of Lake Baikal?
A. About 600 metres deep.
B. Over 1,600 metres deep.
C. Around 6,000 metres deep.
() 8. Why can people float easily in the Dead Sea?
A. Its water is dead.
B. Its water has much more salt.
C. It is the deepest lake in the world.
() 9. What are the speakers talking about?
A. The Great Barrier Reef.
B. The length of the coastline.
C. The living things in the ocean.
() 10. How do wetlands help to clean water?
A. By using sunlight to kill germs.
B. By making the water flow very slowly.
C. By using plants and soil to remove dirt and harmful things.

6.C 7.B 8.B 9.A 10.C

三、听长对话,选择正确的答案。每段对话听两遍。(每小题1.5分,共10.5分)

答案略

听第一段长对话,回答第11至12小题。
() 11. What is Harry doing?
A. Watching a documentary about the Mariana Trench.
B. Reading about the Mariana Trench.
C. Writing a report about the Mariana Trench.
() 12. How long is the Mariana Trench?
A. About 8,800 metres.
B. About 11,000 metres.
C. About 2,550 kilometres.

11.B 12.C