34.Thc passage suggests that Douglas fir trees are

　　（A）a type of alder

　　（B）a type of evergreen

　　（C）similar to sword ferns

　　（D）fast-growing trees

　　35.It can be inferred from paragraph I that hemlock trees

　　（A） are similar in size to alder trees.

　　（B） interfere with the growth of Douglas fir trees

　　（C） reduce the number of alder trees In the forest

　　（D） need less sunlight than do Douglas fir trees

　　36.It can be inferred from paragraph 2 that previous generations of foresters

　　（A） did not study the effects of alders on forests

　　（B） did not want alders In forests

　　（C） harvested alders for lumber

　　（D） used alders to control the growth of evergreens

　　37.The word "they" in line 27 refers to

　　（A） newly developing soils

　　（B） alders

　　（C） bags

　　（D） chemical changes

　　38.According to the passage that alders are used in mountainous areas to

　　（A） nitrogen

　　（B） calcium

　　（C） carbon

　　（D） oxygen

　　39.It can be Inferred from the passage that alders are used in mountainous areas to

　　（A） prevent water from carrying away soil

　　（B） hold the snow

　　（C） protect mines

　　（D） provide material for housing

　　40.What is the author s main purpose in the passage？

　　（A） To argue that alder trees are useful in forest management

　　（B） To explain the life cycle of alder trees

　　（C） To criticize the way alders take over and eliminate forests

　　（D） To illustrate how alder trees control soil erosion

　　Questions 41-50

　　In taking ups new life across the Atlantic， the early European settlers of the United States did not abandon the diversions with which their ancestors had traditionally relieved the tedium of life. Neither the harshness of existence on the new continent nor Line the scattered population nor the disapproval of the clergy discouraged the majority from the pursuit of pleasure.

　　City and country dwellers. of course. conducted this pursuit in different ways. Farm dwellers in their isolation not only found it harder to locate companions in play but also thanks to the unending demands and pressures of their work， felt it necessary to combine fun with purpose. No other set of colonists too so seriously one expression of the period. "Leisure Is time for doing something useful." in the country- side farmers therefore relieved the burden of the daily routine with such double-purpose relaxation as hunting. fishing， and trapping. When a neighbor needed help， families rallied from miles around to assist In building a house or barn， husking corn， shearing sheep. or chopping wood. Food， drink， and celebration after the group work provided relaxation and soothed weary muscles.