2011年托福考试阅读理解全新模拟试题（10）
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
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