阅读下面的短文，然后根据文章内容选择最佳答案。
The Great Barrier Reef, located off the coast of Queensland, Australia, is the world's largest coral reef system, covering over 2,300 kilometers. It is known for its stunning beauty and extraordinary biodiversity, making it a UNESCO World Heritage site. However, the reef is facing numerous challenges, including climate change, pollution, and overfishing.
Climate change is one of the most significant threats to the Great Barrier Reef. Rising sea temperatures are causing coral bleaching, which can lead to the death of coral colonies. The increase in carbon dioxide levels in the atmosphere also results in ocean acidification, which can harm the coral's ability to build their calcium carbonate structures.
Pollution is another issue. Agricultural runoff, industrial discharges, and plastic waste can negatively impact the water quality, harming the marine life that depends on the reef.
Overfishing is yet another concern. The excessive harvesting of fish from the reef disrupts the balance of the ecosystem and can lead to a decline in fish populations, which in turn affects the overall health of the reef.
Conservation efforts are underway to protect the Great Barrier Reef. Measures include reducing carbon emissions to combat climate change, improving water quality through stricter regulations, and establishing marine protected areas to prevent overfishing.
Despite these efforts, the future of the Great Barrier Reef remains uncertain. It is essential to continue raising awareness and taking action to ensure the long-term survival of this remarkable natural wonder.
1、Where is the Great Barrier Reef located?
A. Off the coast of Hawaii.
B. Off the coast of California.
C. Off the coast of Queensland, Australia.
D. Off the coast of Brazil.
2、What is causing coral bleaching in the Great Barrier Reef?
A. Pollution.
B. Overfishing.
C. Rising sea temperatures.
D. Marine protected areas.
3、How does ocean acidification affect the coral in the reef?
A. It enhances their ability to build calcium carbonate structures.
B. It has no impact on the coral's health.
C. It can harm their ability to build calcium carbonate structures.
D. It increases coral biodiversity.
4、What is one of the measures mentioned to protect the Great Barrier Reef?
A. Increasing carbon emissions.
B. relaxing regulations on water quality.
C. Establishing marine protected areas.
D. Encouraging overfishing.
5、What is the main message of the article?
A. The Great Barrier Reef is beyond repair.
B. pollution has no impact on the reef.
C. Climate change, pollution, and overfishing threaten the reef.
D. The reef is thriving and does not need protection.
参考答案：
C. Off the coast of Queensland, Australia.
C. Rising sea temperatures.
C. It can harm their ability to build calcium carbonate structures.
C. Establishing marine protected areas.
C. Climate change, pollution, and overfishing threaten the reef.
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