人教高中英语复习课堂练习23 ：选择性必修1 Unit 5　Revealing nature Word版含解析.doc

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选择性必修第一册　Unit 5　Revealing nature
A组·基础巩固
Ⅰ. 语法填空
A
(2020·湖南长郡中学适应性考试)Chickens are excellent natural enemies of locusts (蝗虫). On average, one chicken can catch over 600 locusts a day and can cover 0.6 acre of grassland.
1. ________ (official) in China's Xinjiang have handed out over 2，200 chickens to local farmers, 2. ________ (hope) to control locusts. There has been a decline in the locust population in several counties 3. ________ the measure has been adopted.
A report predicted 4. ________ (high) than normal incidents of locusts for the northern part of China, 5. ________ (main) owing to warmer winter temperatures. Nearly 10，000 acres in Wushi county have already been destroyed by locusts.
Previous efforts to kill locusts in Xinjiang included pesticides (杀虫剂) that, while effective, also 6. ________ (end) up killing off beneficial insects and harming the ecosystem. Alternatively, only 100 chickens last year in Wushi county were able to effectively limit damage 7. ________ more than 1，300 acres.
This isn't the first time China 8. ________ (use) birds against locusts. A story from The Telegraph described how officials trained 700，000 chickens and ducks 9. ________ (run) after and consume locusts at the sound of a whistle. The campaign, which included nearly 280，000 people, was a response to the country's worst locust outbreak in 10. ________ quarter century