TOEFL Reading Practice Test #52

TOEFL Reading Practice Test #52 - Unstoppable Wildfires in the American West

TOEFL Reading Practice Test #52 - Unstoppable Wildfires in the American West

Forest fires have recently increased in intensity and extent in some forest types throughout the western United States. This recent increase in fires has resulted partly from climate change (the recent trend toward hot, dry summers) and partly from human activities, for complicated reasons that foresters came increasingly to understand about 30 years ago but whose relative importance is still debated. One factor is the direct effect of logging, which often turns a forest into something approximating a huge pile of kindling (wood for burning): the ground in a logged forest may remain covered with branches and treetops, left behind when the valuable trunks are carted away; a dense growth of new vegetation springs up, further increasing the forest’s fuel loads; and the trees logged and removed are of course the biggest and most fire-resistant individuals, leaving behind smaller and more flammable trees.

Another factor is that the United States Forest Service in the first decade of the 1900s adopted the policy of fire suppression (attempting to put out forest fires) for the obvious reason that it did not want valuable timber to go up in smoke, or people’s homes and lives to be threatened. The Forest Service’s announced goal became “Put out every forest fire by 10:00 A.M. on the morning after the day when it is first reported.” Firefighters became much more successful at achieving that goal after 1945, thanks to improved firefighting technology. For a few decades the amount of land burnt annually decreased by 80 percent. That happy situation began to change in the 1980s, due to the increasing frequency of large forest fires that were essentially impossible to extinguish unless rain and low winds combined to help. People began to realize that the United States federal government’s fire-suppression policy was contributing to those big fires and that natural fires caused by lightning had previously played an important role in maintaining forest structure.

The natural role of fire varies with altitude, tree species, and forest type. To take Montana’s low-altitude ponderosa pine forest as an example, historical records, plus counts of annual tree rings and datable fire scars on tree stumps, demonstrated that a ponderosa pine forest experiences a lightning-lit fire about once a decade under natural conditions (i.e., before fire suppression began around 1910 and became effective after 1945). The mature ponderosa trees have bark two inches thick and are relatively resistant to fire, which instead burns out the understory—the lower layer—of fire-sensitive Douglas fir seedlings that have grown up since the previous fire. But after only a decade’s growth until the next fire, those young seedling plants are still too low for fire to spread from them into the crowns of the ponderosa pine trees. Hence the fire remains confined to the ground and understory. As a result, many natural ponderosa pine forests have a parklike appearance, with low fuel loads, big trees spaced apart, and a relatively clear understory.

However, loggers concentrated on removing those big, old, valuable, fire-resistant ponderosa pines, while fire suppression for decades let the understory fill up with Douglas fir saplings that would in turn become valuable when full-grown. Tree densities increased from 30 to 200 trees per acre, the forest’s fuel load increased by a factor of 6, and the government repeatedly failed to appropriate money to thin out the saplings. When a fire finally does start in a sapling-choked forest, whether due to lightning or human carelessness or (regrettably often) intentional arson, the dense, tall saplings (young trees) may become a ladder that allows the fire to jump into the crowns of the trees. The outcome is sometimes an unstoppable inferno.

Foresters now identify the biggest problem in managing Western forests as what to do with those increased fuel loads that built up during the previous half century of effective fire suppression. In the wetter eastern United States, dead trees rot away more quickly than in the drier West, where more dead trees persist like giant matchsticks. In an ideal world, the Forest Service would manage and restore the forests, thin them out, and remove the dense understory by cutting or by controlled small fires. But no politician or voter wants to spend what it would cost to do that.

TOEFL Reading Practice Test #52 Quiz - Unstoppable Wildfires in the American West

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TOEFL Reading Practice Test 52 Unstoppable Wildfires in the American West

TOEFL Reading Practice Test #52 - Unstoppable Wildfires in the American West

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1. The word “approximating” in the passage is closest in meaning to

2 / 10

2. All of the following are mentioned in paragraph 1 as consequences of logging that can promote forest fires EXCEPT:

3 / 10

3. What can be inferred from paragraph 2 about forest-fire suppression before 1900?

4 / 10

4. Why does the author include the quotation “Put out every forest fire by 10:00 A.M. on the morning after the day when it is first reported”?

5 / 10

5. In paragraph 3, what is the author’s purpose in describing the natural cycle of fires in ponderosa pine forests?

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6. According to paragraph 4, why is the human preservation of Douglas fir sapling trees a threat to the ponderosa pine forest?

7 / 10

7. The word “regrettably” in the passage is closest in meaning to

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8. According to paragraph 5, people in the United States would probably not support the described forest-management and restoration techniques because they

9 / 10

9. Directions:
Look at the four squares [■] that indicate where the following sentence could be added to the passage.

Sentence to Insert:
"Such a reduction seemed to demonstrate that the program of fire suppression was having its desired effect."

Excerpt:
Another factor is that the United States Forest Service in the first decade of the 1900s adopted the policy of fire suppression (attempting to put out forest fires) for the obvious reason that it did not want valuable timber to go up in smoke, or people’s homes and lives to be threatened. The Forest Service’s announced goal became “Put out every forest fire by 10:00 A.M. on the morning after the day when it is first reported.” [■][1] Firefighters became much more successful at achieving that goal after 1945, thanks to improved firefighting technology. [■][2] For a few decades the amount of land burnt annually decreased by 80 percent. [■][3] That happy situation began to change in the 1980s, due to the increasing frequency of large forest fires that were essentially impossible to extinguish unless rain and low winds combined to help. [■][4] People began to realize that the United States federal government’s fire-suppression policy was contributing to those big fires and that natural fires caused by lightning had previously played an important role in maintaining forest structure.

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10. Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor details.

Introductory Sentence:
For several reasons, forest fires have increased in number and intensity in the western United States.

Quiz Completed!

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