Wildlife has been greatly threatened in the modem age. There are species（物种）that are 36 every day. The white-naped crane is a typical example. So scientists are trying their best to 37 the species from going out of existence.
Chris and Tim work at a zoo, helping endangered cranes with their 38 . Emma, a female crane, has been in their 39 since she arrived in 2004.
Born at an international crane foundation, Emma was 40 by human caretakers. This led to an unexpected 41 , though she had a wonderful time there. Emma had 42 taken herself as a crane and become deeply attached to humans. She 43 to live with male cranes, and even had a 44 for killing some of them, which made it 45 for her to become a mother.
46 , the two zookeepers didn’t want to see the extinction（灭绝）of this precious species. With their patience and efforts, they successfully developed a 47 （ of artificial breeding人工繁殖）and natural reproduction. This 48 Emma to give birth to five baby cranes.
The two keepers are proud of their productive work. But before they can be 49 , more efforts must be made, because the population of the crane in the wild is on the 50 , and many other species appear headed toward extinction. 51 , not everyone has realized that wildlife has thoughts, feelings, and most importantly, equal rights to survive.
How can we 52 the ever-widening gap that separates us from other animals? Chris and Tim offered us the 53 : human beings took it for granted that their 54 held all the solutions, but maybe their hearts can be a better 55 .
36. A. growing B. migrating C. competing D. disappearing
37. A. ban B. save C. split D. remove
38. A. abortion B. recreation C. reproduction D. administration
40. A. found B. chosen C. raised D. seized
41. A. bonus B. consequence C. victory D. sacrifice
42. A. never B. always C. unluckily D. cheerfully
43. A. liked B. refused C. decided D. hesitated
44. A. gift B. skill C. concern D. reputation
45. A. illegal B. inspiring C. important D. impossible
46. A. Therefore B. Moreover C. However D. Instead
47. A. combination B. collection C. strategy D. system
48. A. forced B. forbade C. taught D. enabled
49. A. defeated B. grateful C. assured D. tolerant
50. A. it B. rise C. agenda D. decline
51. A. In contrast B. After all C. By the way D. On the contrary
52. A. leave B. bridge C. open D. identify
53. A. course B. excuse C. answer D. reward
54. A. brains B. behaviors C. services D. projects
55. A. guide B. treat C. example D. companion
