Task 2. Read the passage again and then answer the following questions. (Đọc lại đoạn văn và trả lời các câu hỏi sau.)

1. What percentage of the earth's surface is covered bu seas and oceans?

2. How do scientists now overcome the challenges of the depth?

3. What can submarines do to help scientists know about the undersea world?

4. What can we learn from the satellite photos?

5. What are the three groups of marine plants and animal?

6. What would happen if the sea biodiversity were not maintained?

Trả lời:

1. 75% of the earth’surface is covered by sea and oceans.

2. They now overcome the challenges of the depth by using modern devices.

3. They investigate the seabed and bring samples of the marine life back to the surface for further study.

4. We can know a wide range of information, including water temperature, depth and the undersea population.

5. They are  those that live on or depend on the bottom like the starfish, those that move independently of water currents and those that are carried along by the currents

6. The marine life would be at stake if the sea bioadversily was not maintained.