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1.What fear do some environmental groups have about thinning?
A.Thinning may cause smaller trees to die faster.
B.Thinning might encourage the cutting down of large trees.
C.Thinning might reduce the budget for keeping forests healthy.
D.Thinning may encourage killing animals that live in the forests.



2.What was the most striking discovery made by Tom Swetnam and his workers when they were studying fire history?
A.Since the late 1800s there has been a definite drop in the number of fires.
B.There have been forest fires going on since the 14th century.
C.Since the 1800s there has been a dramatic increase in forest fires.
D.The trees could give them a detailed history of forest fires.



3.What happened when Covington and two Forest Service researchers experimented with controlled fires in the Coconino National Forest in Arizona?
A.The young trees died and the old trees survived.
B.The flames became uncontrollable.
C.The young trees survived and the old trees died.
D.Flames burned slowly at the foot of the young trees.



4.All of the following are listed as the most important elements of determining how a wildfire behaves EXCEPT
A.the amount of fuel.
B.the amount of water used to control the fire.
C.wind speed.
D.air temperature.



5.Why do some scientists say it would be foolish to try to use thinning to prevent the blazes that might take place in lodgepole pine forests?
A.They say that forests are too big for thinning.
B.They do not see how thinning will prevent the blazes.
C.They say that blazes probably won't happen anyway.
D.They say that fires serve important ecological functions.

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