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[主观题]

The forest from which Man takes his timber is the tallest and most impressive plant commun

ity on Earth. In terms of Man's brief life it appears permanent and unchanging, save for the seasonal growth and fall of the leaves, but to forester it represents the climax of a long succession of events.

No wooded landscape we see today has been forest for all time. Plants have minimum requirements of temperature and moisture and, in ages past, virtually every part of Earth's surface has at some time been either too dry or too cold for plants to survive. However, as soon as climatic conditions change in favour of plant life, a fascinating sequence of changes occurs, called a primary succession.

First to colonize the barren land are the lowly lichens, surviving on bare rock. Slowly, the acids preduced by these organisms crack the rock surface, plant debris accumulates, and mosses establish a shallow root-hold. Ferns may follow and, with short grasses and shrubs, gradually form. a covering of plant life. Roots probe even deeper into the developing soil and eventually large shrubs give way to the first trees. These grow rapidly, cutting off sunlight from the smaller plants, and soon establish complete domination-closing their ranks and forming a climax community which may endure for thousands of years.

Yet even this community is not everlasting. Fire may destroy it outright and settlers may cut it down to gain land for pasture or cultivation. If the land is then abandoned, a secondary succession will take over, developing nmch faster on the more hospitable soil. Shrubs and trees are among the early invaders, their seeds carried by the wind, by birds and lodged in the coats of mammals.

For as long as it stands and thrives, the forest is a vast machine, storing energy and many elements essential for life.

What does the forest strike mankind as permanent？

A．The trees are in community.

B．The forest is renewed each season.

C．Man's life is short in comparison.

D．It is an essential part our lives.

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发布时间：2023-03-08

更多“The forest from which Man takes his timber is the tallest and most impressive plant commun”相关的问题

第1题

It is said that what () the big forest fire was a small cigarette butt.

A.led to

B.resulted from

C.made up

D.put out

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第2题

In each of the following groups of words, there are four underlined letters or letter co

mbinations marked A, B, C and D. Compare the underlined parts and identify the one that is different from the others in pronunciation. Mark your answer by blackening the corresponding letter on the Answer Sheet.

4. A honest B chest C harvest D forest

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第3题

Our boat floated on （漂流) ,between walls of forest too thick to allow us a view of the la

Our boat floated on (漂流) ,between walls of forest too thick to allow us a view of the land we were passing【21】though we knew from the map that our river must from time to time be passing through chains of hills.【22】did we find a place where we could have landed. So we stayed in the boat hoping that we【23】the sea, a friendly fisherman would pick us up and take us to the civilization.

We lived【24】fish, any fruit and nuts we could pick up out of the water. As we had no fire, we had to eat everything,【25】the raw fish. I had never tasted raw fish before, and I must say I did not much enjoy the【26】: perhaps sea-fish which do not live in the mud are less tasteless. As for water, there was a choice: we could drink muddy river water,【27】die of thirst. We drank the water. Men who have just escaped what had appeared to be certain death lose all worries about such small things as diseases caused by dirty water. In fact, none of us suffered from any illness【28】.

One day we passed another village, but fortunately nobody saw us. We did not wish to risk【29】prisoners a second time; we might not be so lucky【30】escape in a stolen boat again.

(56)

A．in

B．down

C．along

D．through

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第4题

People often speak of fire as though it were a living creature--It grows, dances, needs ox

ygen, feeds on whatever it can find, and then dies. And when a forest fire rages out of control, threatening human lives and homes, it must be fought like a "wild animal." The fight is often desperate, since firefighters' best efforts may be dwarfed by the fury of a large fire. But the fire's own traits can be used against it.

The heated air above a fire rises in a pillar of smoke and burnt gases, pulling fresh air in from the sides to replace it. Firefighters use this fact when they "fight fire with fire." They start a fire well in front of the one which they are fighting. Instead of traveling on in front of the huge fire, the smaller fire is pulled back toward it by the updrafts of the larger blaze. As it travels back to meet the large fire, the smaller backfire burns away the fuel that the forest fire needs to survive.

Even when a backfire has been well set, however, the fire may still win the struggle. The wind which the firefighters used to help them may now become their enemy. When the backfire meets the main fire, before both die for lack of fuel, there is tremendous flame, great heat and wild winds. A strong gust may blow the fire into the treetops beyond the area, giving the fire new fuel and a new life.

This passage focuses on ______.

A．how fires start

B．damage caused by fire

C．the fascination of fire

D．fighting forest fires

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第5题

One day Bob took two of his frends into the mountains. They put up their tents and the

n rode off to a forest to see how the trees were growing.

In the aftemoon when they were about ten kilometers from their camp, It started to snow. More and more snow fell. Soon Bob could hardly see his hands before his face. He could not find the road. Bob knew there were two roads. One road went to the camp, and the other went to his house. But all was white snow. Everything was the same. How could he take his friends back to the camp？

Bob had an idea. The horses! Let the horses take them back! But what would happen if the horses took the road to his house？ That would be a trip of thirty-five kilometers in such cold weather! It was getting late. They rode on and on. At last the horses stopped. Where were they？ None of them could tell. John looked around. What was that under the tree？ It was one of their tents!

1.John and his two friends went to the forest to watch the trees in the forest.()

2.They could not f1nd their way back because there was only one road to their camp.()

3.It is clear that they wanted the horses to take them to the camp.()

4.The horses stopped because they were tired after running for along way.()

5.The story happened at night when nothing could be seen.()

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第6题

We can separate the mixture into the pure chemical compounds______it is composed.A．in whic

We can separate the mixture into the pure chemical compounds______it is composed.

A．in which

B．of that

C．of which

D．from which

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第7题

The four travellers__________I shared the room were pleasant people.A.whoB.whomC.from whic

The four travellers__________I shared the room were pleasant people.

A.who

B.whom

C.from which

D.with whom

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第8题

Though often viewed as a problem for western states, the growing frequency of wildfires is

anational concern because of its impact on federal tax dollars, says Professor Max Moritz, a specialistin fire ecology and management.

In 2015, the US Forest Service for the first time spent more than half of its $5.5 billion annualbudget fighting fires－nearly double the percentage it spent on such efforts 20 years ago. In effect,fewer federal funds today are going towards the agency&39;s other work－such as forest conservation,watershed and cultural resources management, and infrastructure upkeep －that affect the lives of all Americans. Another nationwide concern is whether public funds from other agencies are going into constructionin fire-prone districts. As Moritz puts it, how often are federal dollars building homes that are likelyto be lost to a wildfire？

“It’s already a huge problem from a public expenditure perspective for the whole country, We need to take a magnifying glass to that. Like, “Wait a minute, is this OK ？”“Do we want insteadto redirect those funds to concentrate on lower-hazard parts of the landscape？ ” Such a view would require a corresponding shift in the way US society today views fire, researcherssay.

For one thing, conversations about wildfires need to be more inclusive. Over the past decade, thefocus has been on climate change－how the warming of the Earth from greenhouse gases is leadingto conditions that worsen fires. While climate is a key element, Moritz says, it shouldn’t come at the expense of the rest of theequation.

“The human systems and the landscapes we live on are linked, and the interactions go both ways,"he says. Failing to recognize that, he notes, leads to "an overly simplified view of what the solutionsmight be. Our perception of the problem and of what the solution is becomes very limited. At the same time, people continue to treat fire as an event that needs to be wholly controlled andunleashed only out of necessity, says Professor Balch at the University of Colorado. But macknowledging fire&39;s inevitable presence in human life is an attitude crucial to developing the laws,policies, and practices that make it as safe as possible, she says.

“We’ve disconnected ourselves from living with fire, ” Balch says. “It is really important tounderstand and try and tease out what is the human connection with fire today. ”

36.More frequent wildfires have become a national concern because in 2015 they_____.

A.exhausted unprecedented management efforts

B.consumed a record-high percentage of budget

C.severely damaged the ecology of western states

D.caused a huge rise of infrastructure expenditure

While admitting that climate is a key element, Moritz notes that _____.A.public debates have not settled yet

B.fire-fighting conditions are improving

C.other factors should not be overlooked

D.a shift in the view of fire has taken place

The overly simplified view Moritz mentions is a result of failing to _____.A.discover the fundamental makeup of nature

B.explore the mechanism of the human systems

C.maximize the role of landscape in human life

D.understand the interrelations of man and nature

Moritz calls for the use of "a magnifying glass" to _____.A.raise more funds for fire-prone areas

B.avoid the redirection of federal money

C.find wildfire-free parts of the landscape

D.guarantee safer spending of public funds

Professor Balch points out that fire is something man should _____.A.do away with

B.come to terms with

C.pay a price for

D.keep away from

请帮忙给出每个问题的正确答案和分析，谢谢！

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第9题

For the 1+1 unidirectional path protection and 1:1 bidirectional path protection, whic

A.The PTN equipment supports 1+1 unidirectional path protection and 1:1 bidirectional path protection.

B.1:1 bidirectional path protection supports return mode and non-return mod

C.The protection delay can be configured to be 0-10 s (with the step length of 100 ms).

D.In the return mode, WTR can be configure to be 1-12 min (with the step length of 1 min).

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第10题

Are you planning a vacation？ If you like hot and extremely dry summers, go to Phoenix, Ari

zona. For hot temperatures but lots of rain and thunderstorms, try Miami, Florida. If you want average temperatures and rainfall, St. Louis, Missouri, is the spot. Or if you' re a cold weather fan, head to Fairbanks, Alaska. Its winters are very cold with little precipitation. Each of these cities has a certain type of weather. The average weather for a place over many years is called climate, and in no two places in (he world is it exactly the same. How can this be？

Many things in nature, such as sunshine, temperature, and precipitation, affect climate. Nearness to mountain, oceans, and large lakes affects it loo. Another factor is altitude, or height above sea level. Air cools as altitude increases. So a city at a higher altitude may be colder than one at a lower altitude. Finally, winds affect climate. They move heat and moisture between the oceans and continents. Winds keep the tropics from overheating. They keep the polar regions from getting overly cold.

Climate changes over long periods of time. Some scientists think, for example, that the earth' s climate changed at the time of the dinosaurs. They think the dinosaurs died because of the change. What causes a climate to change？ One possible cause may be changes in the sun. Sunspots, for example, are cool, dark spots that form. on the sun. Sunspots may decrease precipitation on the earth and cause unusually dry periods. Changes in the atmosphere may change climate too. Volcanic eruptions, for instance, release solid particles into the air. These particles may form. a cloud that blocks out the sun ' s heat. Human activity is another cause of climate change. Air pollution and the reduction of forest cover may have long-term effects on climate.

This passage is concerned with things that affect______.

A．precipitation

B．climate

C．altitude

D．sunspots

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