阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。
Diets have changed in China-and so too has its top crop. Since 2011,the country____（grow）more corn than rice. Corn production has jumped nearly 125 percent over____past 25 years, while rice has increased only 7 percent.
A taste for meat is____(actual) behind the change. An important part of its corn is used to feed chickens, pigs, and cattle. Another reason for corn's rise. The government encourages farmers to grow corn instead of rice____(improve) water quality. Corn uses less water____rice and creates less fertilizer(化肥) runoff. This switch has decreased____(pollute) in the country's major lakes and reservoirs and made drinking water safer for people.
According to the World Bank, China accounts for about 30 percent of total____(globe)fertilizer consumption. The Chinese Ministry of Agriculture finds that between 2005-when the government ____ (start) a soil-testing program ____ gives specific fertilizer recommendations to farmers - and 2011, fertilizer use dropped by 7.7 million tons. That prevented the emission(排放) of 51.8 million tons of carbon dioxide. China's approach to protecting its environment while ____ (feed) its citizens "offers useful lessons for agriculture and food policymakers worldwide." says the bank's Juergen Voegele.
