【语法填词】 One ­ eighth of all 36. (know) bird species are threatened with extinction ( 灭绝 ) , warns a global report. That is 1,469 species 37. er out of almost 11,000. Farming is 38. biggest threat : 1,091 of the threatened bird species are in trouble because of the growth of agriculture. Farms now occupy six times as much of Earth’s land suce as they 39. (do) over 300 years ago,40. (rise) from 6 to 38 percent between 1700 and today. “It’s being driven by changing human consumption 41. (pattern) , particularly an increasing switch to a high ­ meat diet , ” says Tris Allinson of BirdLife International.“ Today , two ­ and ­ a ­ half times more people are overweight 42. undernourished ( 营养不良的 ) . ” The growth of agriculture is destroying bird habitats. Farms are spreading out onto ever more land to grow things like cocoa , sugar , and coffee. This loss of habitat is even putting 43. (press) on relatively common species , like turtle doves in Europe and Asia and grey parrots in Africa.“The trend we’re 44. (real) noticing is seeing more familiar , widespread species in trouble , ”says Allinson. Allinson says we can save many of the threatened birds. “We do know how 45. (improve) degraded ecosystems , and we can farm more effectively , ” he says.