11、 The test results are beyond __________; they have been repeated in labs all over the world．
A．negotiation
B．conflict
C．bargain
D．dispute


12、 Deserts and high mountains have always been a __________ to the movement of people from place to place．
A．barrier
B．fence
C．prevention 
D．jam


13、 Computer power now allows automatic searches of fingerprint files to match a print at a crime__________．
A．stage 
B．scene
C．location
D．occasion


14、 There is a__________ of impatience in the tone of his voice．
A．hint
B．notion
C．dot
D．phrase


15、 Politically these nations tend to be __________, with very high birth rates but poor education and very low levels of literacy．
A．unstable
B．reluctant
C．rational
D．unsteady


16、 Most laboratory and field studies of human behavior __________taking a situational photograph at a given time and in a given place．
A．involve
B．compose
C．enclose
D．attach


17、 Research shows that there is no __________ relationship between how much a person earns and whether he feels good about life．
A．successive 
B．subsequent
C．significant 
D．sincere


18、 Companies are struggling to find the right __________ between supply and demand, but it is no easy task．
A．equation
B．formula
C．balance
D．pattern


19、 Being ignorant of the law is not accepted as an __________ for breaking the law．
A．excuse
B．intention 
C．option
D．approval


20、 Thomas Jefferson and John Adams died on July 4, 1826, the fiftieth __________ of AmericanIndependence．
A．ceremony 
B．occasion
C．occurrence 
D．anniversary

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