Wetlands-lakes, rivers, marshes and coasts（保护生物多样性）, control floods and remove pollutants. They are also helpful to rice and fish production, transportation and so on. They are important and necessary feeding and breeding grounds for migratory birds. They are the most threatened ecosystem（受到威胁的生态系统）.

   World Wetlands Day came from the Convention on Wetlands（湿地公约） signed in Iran, China joined the convention on July 31, our country had 57 wetland nature reserves listed as major wetlands for protection under the convention, covering a total of nearly 7 million hectares. ______, 10 percent of the world's wetland areas, which comes fourth in the world. China also has some of Asia's most important wetlands, such as Poyang Lake and Asia's longest river, Yangtze River.

   However, a WWF research showed China's wetlands were seriously threatened by degradationbecause of pollution, climate change and over﹣exploitation. So our government has been taking actions to return farmland to wetland and remove some fish farms.

   It was reported the 57 key Chinese wetlands increased by 2, 479 hectares from 2018 to 2019. Li Yan, an official from the National Forestry and Grassland Administration, "The area of wetlands in China has become larger over the past five years, growing by 202, 600 hectares and making a great contribution to water quality and environmental protection. Between 2016 and 2020, China created 201 national wetland parks. China created 201 national wetland parks. China had 899 national wetland parks by the end of 2020, and nearly half of the country's wetlands are protected by some level of government. "

   China is carrying through on the convention for a continuous development and will make continuing efforts to perfect the laws on wetland protection. Several major projects on wetland protection will be carried out in some major areas, such as Yangtze River and the Beijing﹣Tianjin﹣Hebei province cluster.

（1）Which of the following is the most suitable for the blank（空格） in Paragraph 2？ 　 　

A．	World Wetlands Day is well﹣known
B．	Wetlands in China are seriously threatened
C．	China doesn't have large areas of wetlands
D．	Protection of wetlands in China is very important

（2）The underlined word "degradation" in Paragraph 3 probably means 　 　.

A．	the process of something being made better
B．	the process of something being made worse
C．	the situation in which somebody has won all the respect
D．	the situation in which somebody has lost all the respect

（3）The writer lists some numbers in Paragraph 4 in order to 　 　.

A．	introduce how large China's wetlands are
B．	explain how important China's wetlands are
C．	prove how much danger China's wetlands are facing at present
D．	show the achievements on wetland protection China has reached

（4）What's the best title for the passage？ 　 　

A．	Wetlands in China are Famous.
B．	China Makes Laws on Wetland Protection.
C．	China's Wetlands are in Danger.
D．	China Makes Progress on Wetland Protection.