Dongying city in China’s Shandong Province has witnessed(目睹) ecological improvements in the Yellow River Delta, thanks to various【小题1】(effect) measures to improve wetland restoration and protection.

Years ago, the wetlands there【小题2】(threaten) due to less water from the river and other factors.【小题3】(protect) the wetlands ecosystem, the Yellow River Delta National Nature Reserve was established in 1992. Since then, the city【小题4】(carry) out several management projects and restored the biotic(生物) population in the zone.

Dongying has been adopting a comprehensive wetlands restoration model by giving high 【小题5】(prior) to protecting the nature reserve and letting nature restore 【小题6】(it). Over the past three years, it’s transferred(转运) 469 million cubic meters of water to the nature reserve,【小题7】has recovered the ecological functions of the wetlands there.

Last year, Dongying built a real-time monitoring network for bird species at the nature reserve, which helps ensure that birds are free【小题8】disturbance of human activity and puts the habitats of cranes and other species under key protection. As a result, the nature reserve has seen【小题9】obvious increase in the variety and number of bird species. Home to 371 bird species, it’s become an important stop, wintering ground and breeding place for migratory birds. Dongying is currently working to build the Yellow River Estuary National Park, which will cover 3,523 square kilometers,【小题10】(include) land area and sea area, to explore pathways for the protection of Delta ecology.

Hunters used dogs to help track and kill pandas in China until the country declared 【小题1】 law to protect the species. But dogs are still threatening the safety of this species.

Researchers 【小题2】(begin) their investigation when two captive-born(圈养出生的) pandas, which had been released into Liziping Nature Reserve, were attacked by dogs.

There are dogs in panda reserves because there are villagers 【小题3】(live) near the reserves and people have dogs. An adult panda is quite able to defend 【小题4】(it) against one dog. However, 【小题5】 is hard to beat a pack of dogs.

In the study 【小题6】(publish) in Scientific Reports, the researchers found dogs can wander more than 10 kilometers a night, some of 【小题7】 even live in the reserves. Earlier research found that pandas need a habitat of 【小题8】(rough) 114 square kilometers to thrive (茁壮成长). Although most of the nature reserves for the pandas are large enough 【小题9】(maintain) their populations, the panda’s territory could become smaller if dogs become part of it.

“The Chinese government has vaccinated(给……接种疫苗) the dogs and helped the villagers either remove the dogs or control them all the time. So things are getting much 【小题10】(good),” James Spotila said.

As one of the most well-known tourist 【小题1】 (attraction) in China's Guangxi Zhuang Autonomous Region, the beautiful Li River was polluted. Water in the river suffered 【小题2】 (great) as tourists threw rubbish into the river. Besides, people on the boats 【小题3】 (pour) the oil from the kitchens into the water. Also chemicals used to increase crop production resulted 【小题4】 poor water quality, causing a decrease in the number of fish species. Luckily, local officials were concerned about the issue and began to take steps 【小题5】 (address) it. By 【小题6】 (construct) waste water treatment facilities and closing or moving polluting enterprises, 【小题7】 water quality was improved. Not only were new rules introduced to preserve the river, 【小题8】 the local authorities also used the media to spread environmental 【小题9】 (aware) and encourage greater use of clean energy. With these measures, China's waterways are heading towards a clean and 【小题10】 (sustain) future.