A reasonable attitude to invaders need not imply passivity. A few foreign species are truly __53__ and should be fought: the Nile perch – a fish, has helped drive many species of fish to extinction in Lake Victoria. It makes sense to __54__ pathogens (病菌), especially those that destroy whole native tree species, and to stop known agricultural pests from gaining a foothold. Fencing off wildlife reserves to create open-air ecological museums is fine, too. And it is a good idea for European gardeners to destroy Japanese plants, just as they give no apace to native harmful grasses like bindweed and ground elder. You can garden in a garden. You cannot garden __55__. That is universally accepted.

41. A. multiplied B. shrunk C. disappeared D. harvested

42. A. conserve B. eliminate C. investigate D. prioritize

43. A. healthy B. intentional C. harmful D. profitable

44. A. As a result B. For example C. By contrast D. In fact

45. A. attraction B. dominance C. annoyance D. substitute

46. A. increases B. destroys C. reveals D. targets

47. A. oppressed B. disturbed C. cultivated D. preserved

48. A. acceptable B. needless C. mistaken D. convincing

49. A. fuel(l)ed B. organized C. interrupted D. greeted

50. A. civilization B. interference C. interaction D. maintenance

51. A. tolerable B. impossible C. beneficial D. critical

52. A. reluctant B. disorderly C. invalid D. unbalanced

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