9 The Constitutions vague nature has given it the flexibility to be adapted when circumstances change
A imprecise B apparent
C clear D easy
10Gambling is lawful in Nevada.
A enjoyable B irresistible
C legal D profitable
11These are the motives for doing it
A reasons B excuses
C answers D replies
12The river widens considerably as it begins to turn west
A extends B stretches
C broadens D 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
参考答案：ACCDB ADBAC ACCDB