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1. A）not be sustained in the long term

2. B）Intergenerational conflicts will intensify

3. D）politicians are afraid of losing votes in the next election

4. A）allow people to work longer

5. D）younger workers are readily available

6. B）large numbers of immigrants from overseas

7. B）They find it hard to balance career and family

8. take risks

9. have families

10. military service

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47. feminine and weak

48. lose composure

49. stress-related disorders

50. their emotional inexpressiveness

51. aggressive

52. A）solve virtually all existing problems

53. D）They realized science and technology alone were no guarantee for a better world

54. B）Some Asian countries have overtaken America in basic scienes

55. A）Insufficient funding

56. C）Humanistic thinking helps define our culture and values

57. D）It will be some time before a new Einstein emerges

58. B）His independent and abstract thinking

59. D）They often go into fields yielding greater financial benefits

60. C）Papers like Einstein’s would unlikely get published today

61. B）was little known in academic circles