单项选择题

Britain is facing a (31) rise in its rat population (32) growing numbers of people leave fast food scraps in the street, an environment group warned. Keep Britain Tidy said the rodents were (33) their traditional haunts underground and were roaming the streets, enticed (34) discarded remnants of burgers, pizzas and crisps. "The rat population is (35) the rise and soon it’ 11 be as common to see a rodent on our street (36) it is to see a dog or a cat," said group Director, Sue Nelson. The practice of dumping fast food fitter and scraps on the street (37) in the trash—with young men the worst offenders—was behind the rise. (38) to the National Rodent Survey in 2001, Britain’s rat population has grown by nearly one quarter since 1998 and is now (39) at 60 million, two million more than the (40) population. On (41) a rat can give (42) every 24-28 days and just a single pair of rats can (43) a colony of 2,000 a year. Around 200 Britons a year (44) Weft’s Disease—an infection which can (45) kidney or liver (46) and eventually (47) and which is carried in rat’s urine. To (48) the issue, Keep Britain Tidy launched a cinema (49) entitled "How Close do You Want Them to Get" The ad culminates in a shocking image of a young woman sleeping in a bed of rats-echoing the nightmare scenario from James Herbert’ s classic horror tale The Rats, in which mutant rodents begin to prey (50) humans.