[C]Taking a global look at the whole of mankind, regional variations of habitat may be put aside for a description of the major physical characteristics of our planet.

　　[D] Quantifiable definitions of these concepts are needed for measuring progress toward development goals. A typical starting point has been to break down the overall objective of human welfare into sub-objectives or targets.

　　[E] The human environment is in the process of becoming so diverse that sub-categories are so far from their starting point that the subsequent subjectivity makes it impossible to have clear objectives.

　　[F] The biosphere is the part of the physical world where life can exist, and includes the living organisms themselves. It extends into all other spheres and is usually broken down into biotic and abiotic components.

　　[G] Social groups such as nations, tribes and families interact in numerous ways, both aggressive and cooperative, and cause distinctive impacts, both productive and destructive, on the biophysical environment.

　　参考答案

　　Part A

　　Text 3: 11. B 12. D 13. A 14. D 15. C

　　Text 4: 16. C 17. B 18. A 19. C 20. A

　　Part B

　　21. C 22. F 23. G 24. B 25. D

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