Soal Latihan dan Jawaban Reading Comprehension 60

Monday, March 26th, 2012 - reading comprehension

Growing tightly packed together and collectively weaving a dense canopy of

branches, a stand of red alder trees can totally dominate a site to the exclusion of

almost everything else. Certain species such as salmonberry and sword ferns have

adapted to the limited sunlight dappling through the canopy, but few evergreen trees

(5)  will survive there; still fewer can compete with the early prodigious growth of alders.

A Douglas fir tree reaches its maximum rate of growth ten years later than an alder,

and if the two of them begin life at the same time, the alder quickly outgrows and

dominates the Douglas fir. After an alder canopy has closed, the Douglas fir suffers a

marked decrease in growth, often dying within seven years. Even more shade-tolerant

(10)  species of trees such as hemlock may remain badly suppressed beneath aggressive

young alders.

 

Companies engaged in intensive timber cropping naturally take a dim view of alders

suppressing more valuable evergreen trees. But times are changing; a new generation

of foresters seems better prepared to include in their management plans consideration

(15)  of the vital ecological role alders, play.

 

Among the alder’s valuable ecological contributions is its capacity to fix nitrogen in

nitrogen-deficient soils. Alder roots contain clusters of nitrogen-fixing nodules like

those found on legumes such as beans. in addition, newly developing soils exposed by

recent glacier retreat and planted with alders show that these trees are applying the

(20)  equivalent of ten bags of high-nitrogen fertilizer to each hectare per year. Other

chemical changes to soil in which they are growing include a lowering of the base

content and rise in soil acidity, as well as a substantial addition of carbon and calcium

to the soil.

 

Another important role many alders play in the wild, particularly in mountainous

(25)  areas, is to check the rush of water during spring melt. In Japan and elsewhere, the

trees are planted to stabilize soil on steep mountain slopes. Similarly, alders have been

planted to stabilize and rehabilitate waste material left over from old mines, flood

deposits, and landslide areas in both Europe and Asia.

 

Reading Comprehension 60

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Question 1
What does the passage mainly discuss?
A
Differences between alder trees and Douglas fir trees
B
Alder trees as a source of timber
C
The relation of alder trees to their forest environments
D
Management plans for using alder trees to improve soil
Question 2
The word "dense" in line I is closest in meaning to
A
broad
B
thick
C
dark
D
tall
Question 3
Alder trees can suppress the growth of nearby trees by depriving them of
A
sunlight
B
nitrogen
C
water
D
soil nutrients
Question 4
The passage suggests that Douglas fir trees are
A
fast-growing trees
B
a type of evergreen
C
a type of alder
D
similar to sword ferns
Question 5
It can be inferred from paragraph I that hemlock trees
A
need less sunlight than do Douglas fir trees
B
interfere with the growth of Douglas fir trees
C
reduce the number of alder trees In the forest
D
are similar in size to alder trees.
Question 6
It can be inferred from paragraph 2 that previous generations of foresters
A
did not study the effects of alders on forests
B
harvested alders for lumber
C
used alders to control the growth of evergreens
D
did not want alders In forests
Question 7
The word "they" in line 21 refers to
A
alders
B
chemical changes
C
bags
D
newly developing soils
Question 8
According to the passage that alders are used in mountainous areas to
A
oxygen
B
nitrogen
C
carbon
D
calcium
Question 9
It can be Inferred from the passage that alders are used in mountainous areas to
A
prevent water from carrying away soil
B
protect mines
C
hold the snow
D
provide material for housing
Question 10
What is the author's main purpose in the passage?
A
To criticize the way alders take over and eliminate forests
B
To illustrate how alder trees control soil erosion
C
To argue that alder trees are useful in forest management
D
To explain the life cycle of alder trees
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