84. Differences in habitat could lead to different living habits.

参考范文：

Nowadays,most of my classmates aren’t willing to communicate with their parents or share their inner thoughts with their parents and always find it hard to seek support and advice from them, the reason of which is that they feel that they are not equal in position and parents lay too much emphasis on the children’s study.

In my opinion,the relationship between parents and children should be one filled with love, care and understanding, in which parents and children are equal and they can show respect for each other and exchange ideas freely. To build a relationship of this kind , parents should become friends of their children while children ought to place more trust in their teachers and give voice to their inner feelings frankly. Only in this way can we enjoy a warm relationship between parents and children.

(132 words)

83. They lock their feet around a branch.

82. By changing its body colors.

81. 8.

78. about widening divisions　 79. the government’s power 　　　80. Comments

75. Best-known books 　　　76. The Affluent Society 　　　　　77.road plan　

71. Two influential thinkers　 72. Names　　 73. April twenty-ninth 　　74.Status

52. that 　　　53. early　 　 　　54.but 　　　　　　55. easier

56-60 DADDD　　 61-65 BCDBA　　 66-70 CADDB

48.give 　　　49. after 　　　50. themselves　 　　51. them　

18.work experience　 19. a job　　 20. relatives or friends

21-25 AAABB　 26-30 DCDAD　 31-35 DABBA

36-40 BCDBD　 41-45 BACAB　 46-47 BC