34.Thc passage suggests that Douglas fir trees are （A）a type of alder: Z0 G4 W* Y. |) G$ Y+ T9 o. A: I
（B）a type of evergreen
# _4 }5 y' K/ a. F6 g/ p （C）similar to sword ferns
1 e; [, s8 z7 g0 }7 Z9 d5 z7 n （D）fast-growing trees
$ @* N' i+ v y# V' V7 k 35.It can be inferred from paragraph I that hemlock trees
6 G5 D8 g- T6 r7 y8 a （A） are similar in size to alder trees.
& T \! F5 ~2 d& Y! @9 m （B） interfere with the growth of Douglas fir trees
; M7 y$ H* z$ X' t& f e' z# E （C） reduce the number of alder trees In the forest
# C9 d3 B$ i0 j7 ^7 C- ~: Z （D） need less sunlight than do Douglas fir trees K8 e6 K/ r7 y! I8 c
36.It can be inferred from paragraph 2 that previous generations of foresters
& m+ H- g; M- ^. X$ L6 C （A） did not study the effects of alders on forests2 _* _, m# |5 D1 o" D8 a, V9 {) q
（B） did not want alders In forests
) E* f; \: q* y+ \0 T( ~( w （C） harvested alders for lumber
% X% }2 i6 v( v$ C) l （D） used alders to control the growth of evergreens
9 |' P& V2 Y$ l$ G& K8 k7 } 37.The word "they" in line 27 refers to
# `! J5 A0 e% v A7 | （A） newly developing soils& W& _6 S" n4 `6 t! ?
（B） alders
8 T+ L3 w5 K1 S7 n （C） bags- D, X& z: e9 t, F/ \5 V' @6 l
（D） chemical changes1 z$ g6 n3 w* E( k: a0 o
38.According to the passage that alders are used in mountainous areas to
4 Z7 S9 U3 z- C. M9 x （A） nitrogen
! n# U5 c8 {' M3 D( D （B） calcium
+ {5 j ~" K+ |) L A( r4 N （C） carbon
1 Z( v9 P1 G @/ s3 _% S) i （D） oxygen |
发表于 2012-8-14 22:15:45
