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题型:阅读理解-阅读单选 难度:0.65 引用次数:181 题号:16381110

The mangrove tree might not look very impressive, but it is an essential part of our ecosystem. However, more than half of the mangrove forests have been destroyed in the past century. Several World Heritage Sites have been listed largely because of their mangrove ecosystems. Among them are the Sundarbans across India and Bangladesh, the Everglades National Park in the US, and the Great Barrier Reef in Australia.

Being a World Heritage Site requires for the mangroves to be protected. However, one country in Asia has gone further by having a five-year program to protect and conserve all their mangroves. They even have a mangrove museum and observe World Mangrove Day. This country is Sri Lanka. Why are mangrove trees so important to Sri Lanka and to other countries where mangroves grow?

The mangrove tree grows along coastal saltwater shorelines. They have adapted to the harsh coastal weather and have deep roots. This means that they are strong and cannot be easily removed. In countries where natural disasters such as tsunamis and cyclones occur, the forests provide protection. The villages in Sri Lanka with full mangrove forests have suffered less damage when hit by these natural disasters. The reason is that the mangroves break up the force and strength of the waves.

The mangroves also quickly absorb carbon dioxide and send oxygen into the atmosphere. This makes them an important part of the fight against climate change. They absorb far more carbon dioxide than other types of forest, and store it in their structure and even in the soil. This is important as carbon dioxide in the atmosphere is believed to be a cause of detrimental changes in the weather, such as global warming.

The strong roots also provide protection for young fish as they grow. With the oceans around the world being overfished, it is important to maintain the ecological balance in the oceans. For Sri Lanka, one of the threats to the mangrove forests is the shrimp farms being set up. To build saltwater ponds for the shrimps, the mangroves are cut down. This has resulted in fewer fish surviving among the mangrove roots and fewer fish being caught by the fishermen. The local fishing communities noticed that they were losing money and it made them aware of how important the mangroves were. They are now helping to conserve the forests.

Sri Lanka is showing that a nation can preserve all of its mangroves. The conservation model they have can be used by other countries. It might take many years of planning, but the benefits of saving mangroves definitely outweigh the costs.

1. What do we know about the mangrove trees from the passage?
A.They are mainly grown in Australia.
B.They can prevent young fish from growing.
C.They have been damaged by natural disasters.
D.They are less impressive but important to the ecosystem.
2. What has been done in Sri Lanka to protect mangroves?
A.A world mangrove festival has been founded.
B.Saltwater ponds for the shrimps have been set up.
C.A 5-year mangroves protecting program has been started.
D.More mangroves along the coastal areas have been grown.
3. What does Paragraph 4 mainly talk about?
A.The mangroves can keep the ecological balance in the oceans.
B.The mangroves are essential for fighting against climate change.
C.The mangroves have deep roots and hold the soil in place firmly.
D.The mangroves can break up the force and strength of the waves.
4. What is the author’s attitude towards the future conservation of mangroves?
A.Positive.B.Negative.C.Doubtful.D.Unclear.
【知识点】 环境保护 说明文

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【推荐1】Zoos divide opinion: there are those who think it is cruel to keep animals locked up while others believe zoos are essential for the survival of endangered species (濒危物种).

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