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8 In the background was that eternal hum.

A long B never-ending

C boring D extensive

9 The Constitution's vague nature has given it the flexibility to be adapted when circumstances change.

A imprecise B apparent

C clear 13 easy

10 Gambling is lawful in Nevada.

A enjoyable B irresistible

C legal D profitable

11 These are the motives for doing it.

A reasons B excuses

C answers D replies

12 The river widens considerably as it begins to turn west.

A extends B stretches

C broadens 13 bends

13 Many economists have given in to the fatal lure of mathematics.

A error B puzzle

C attraction D contradiction

14 With immense relief I stopped running.

A no B little

C scarce D enormous

15 A great deal has been done to remedy the situation

A maintain B improve

C preserve D protect

答案：8. B 9. A 10. C 11. A 12. C 13. C 14. D 15. B