At migration(迁途) time. These creatures, like most other water birds, are generally made unable to fly by the 65 of cutting off a tip of the wing bone. 66 such swans in the zoo generally seem happy under 67 care and they raise their young without any trouble, at migration time things become 68. The birds never really 69 that they can no longer fly, and repeatedly swim to the 70 of the pond so that they can have the whole extent of its surface when trying to 71 against the wind. Meanwhile, their loud flying calls can be heard as they try to 72, and again and again the grand preparations end in 73.

　　I do not like seeing those 74 water birds in the zoo. The missing tip of one wing and the still sadder picture that the bird makes when it 75 its wings hurt me badly. What a truly sorry picture it is。

　　56. A. high    B. highly  

　　C. deep    D. deeply

　　57. A. whose    B. whom  

　　C. that   D. which

　　58. A. find    B. lose   

　　C. declare   D. transform

　　59. A. to be put   B. being put  

　　C. to put   D. putting

　　60. A. partly    B. highly  

　　C. deeply   D. freely

　　61. A. kept     B. keeping   

　　C. roes     D. rising

　　62. A. victorious   B. thoughtful   

　　C. miserable    D. fortunate

　　63. A. scattered    B. written  

　　C. noticed    D. wakened

　　A similar    B. suitable    

　　C. apparent                D. constant

　　A. experiment               B. operation

　　treatment                D. movement

　　A. Although                B. when

　　Since                   D. Because

　　A original                 B. proper

　　C. parallel                 D. precious

　　68.A. private                 B . public

　　C. different               D. similar

　　A. Suggest               B. assure

　　underline              D. realize