_______(19)




A.evaluation
B.chance
C.price
D.cost

Which area is considered one of the most industrialized?




A.Europe
B.South America
C.Middle East
D.Asia

Natural pollutants can play an important role in controlling air pollution for which of the following reasons?




A.They function as part of a purification process.
B.They occur in greater quantities than other pollutants.
C.They are less harmful to living beings than are other pollutants.
D.They have existed since the Earth developed.

According to the passage, the most important factor in the development of agriculture around Los Angeles was the ____________ .




A.influx of "new residents to agricultural areas near the city
B.construction of an aqueduct
C.expansion of transportation facilities
D.development of new connections to the city's natural harbor

Peter was out of town that Sunday. Therefore, he _____ the crime.




A.couldn't have committed
B.needn't have committed
C.must have committed
D.might have not committed

There's a world of difference between being a teacher and a student.




A.a great similarity
B.a yawning gap
C.on the contrary
D.a great divide

No matter __________, Mozart was an accomplished composer while still a child.




A.how it remarkable seems
B.how it seems remarkable
C.how seems it remarkable
D.how remarkable it seems

Following the accident, he was officially accused of _________ driving.




A.reckless
B.careful
C.hurry
D.responsible

Why did it take so long to develop the x-ray microscope?




A.Funds for research were insufficient.
B.The source of illumination was not bright enough until recently
C.Materials used to manufacture x-ray tubes were difficult to obtain
D.X-ray microscopes were too complicated to operate.

Based on the information in the passage, what can be inferred about x-ray microscopes in the future?




A.They will eventually change the illumination range that they now use
B.They will provide information not available from other kinds of microscopes.
C.hey will eventually be much cheaper to produce than they are now.
D.They will probably replace electron microscopes altogether.