Directions: After reading the passage below, fill in the blanks to make the passages coherent and grammatically correct. For the blanks with a given word, fill n each blank with the proper form of the given word; for the other blanks, use one word that best fits each blank.Green efforts produce promising results along upper reaches of Yangtze River
Every late autumn, groups of black-headed gulls (海鸥) arrive “as【小题1】 (schedule)” in Luzhou city on the upper reaches (上游) of the Yangtze River. 【小题2】 (circle) over the water, the oceanic birds always attract a crowd of bind watchers.
Besides Luzhou, the migratory birds are also frequent visitors to Sichuan’s Deyang, Neijiang and other cities 【小题3】 the Tuojiang River flows. Local enthusiasts have all set up bird-watching and bird-love associations.
The black-headed gull, a rare bird species 【小题4】 white feathers and red beak and claws, is regarded as the “barometer” (风向标) of the ecological environment in watersheds (流域). The spotting of these black-headed birds reflects the promising results produced by Sichuan’s green efforts in recent years.
Among Sichuan’s many water systems, the Tuojiang River shares a vital position, 【小题5】 because it is an essential tributary (支流) of the Yangtze River, but also due to the fact 【小题6】 the 25,500 square kilometers it flows through cover the most concentrated, densely populated and economically powerful areas in the province.
Since the 1990s, the continuous acceleration of industrialization and urbanization exerted huge environmental burdens on the Tuojiang River, making it once 【小题7】 (polluted) river in Sichuan.
Consequently, a campaign to treat water pollution 【小题8】 (launch) in 2018. After years of efforts, the water quality of the Tuojiang River flowing into the estuary (河口) of the Yangtze River has now reached its best level in 20 years.
Chengdu, the provincial capital, has embraced more blue skies in recent years 【小题9】 the promotion of air pollution prevention and control work.
According to the Chengdu Mountain View Data Report released annually by a large group of photography enthusiasts, the number of days 【小题10】 people were able to see snow mountains from downtown Chengdu increased from 50 days in 2017 to 63 days in 2021.