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A．The soil has been overworked.
B．The climate is cold.
C．The weather is too dry.
D．The soil is sandy.
答案
更多“A．The soil has been overworked.B．The climate is cold.C．The weather is too dry.D．The so”相关的问题
第1题
The study published in the journal Nature indicates that ______.
A．the Clean Air Act has not produced the desired results
B．lead deposits in arctic snow are on the increase
C．lead will stay in soil and snow longer than expected
D．the US is the major source of lead pollution in arctic snow
第2题
What is the main problem caused by the usual way of plowing？
A．The crop's blooming period is delayed.
B．The roots of crops are cut off.
C．The topsoil is seriously damaged.
D．The growth of weeds is accelerated.
第3题
Soil that is rich in organic matters ___________.
A.has had chemicals and fertilizers added to it
B.contains vegetable matter that has not been consumed
C.has been nourished by fertilizers
D.already contains large quantities of vitamins and minerals
第4题
听力原文： Farmers usually use plows to prepare their fields for planting crops. Plows cut into the ground, and lift up weeds, and other unwanted plants. However, plowing is blamed for causing severe damage to top soil by removing the plants that protect soil from being blown or washed away. Many farmers in South Asia are now trying a process called Low Till Farming. Low Till Farming limits the use of plows. In this method of farming, seeds and fertilizer are put into the soil through small cuts made in the surface of the ground. Low Till Agriculture leaves much or all the soil and remains of plants on the ground. They serve as a natural fertilizer and help support the roots of future crops. They take in rain and allow it to flow into the soil instead of running off. It has been proved that Low Till Farming increases har-vests and reduces water use, and this method reduces the need for chemical products because there are fewer unwanted plants. Scientists say Low Till Farming is becoming popular in South Asia, which is facing a severe water shortage. They say the area will become dependent on imported food unless water is saved through methods like Low Till Farming. Currently, more than 150 million people in South Asia depend on local rice and wheat crops. Farmers grow rice during wet weather. During the dry season they grow wheat in the same fields. Farmers are using the Low Till Farming method to plant wheat after harvesting rice. Scientists say Low Till Agriculture is one of the best examples in the world of technologies working for both people and the environment.
What is me main problem caused by the usual way of plowing？
A．The crop's blooming period is delayed.
B．The roots of crops are cut off.
C．The topsoil is seriously damaged.
D．The growth of weeds is accelerated.
第5题
Who has been there？
A．The woman.
B．The man.
C．Neither.
第6题
"This practice" in Paragraph 4 refers to_______.
A.that farmers have lowered the yield of corn and soybean
B.that farmers have expanded croplands
C.that farmers have applied more chemical fertilizers
D.that the top soil has been decreased greatly
第7题
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.
第8题
Which train has now been cancelled？
A．The train to Jinan．
B．The train to Zhengzhou．
C．The train to Hangzhou．
第9题
A．The man needs to sec a doctor for some counseling.
B．The man has been frightened by the UFO.
C．The man shouldn't go to the party.
D．The man has been hurt by the beast and needs to see a doctor.
第10题
The relative stability of the human population has been upset by ______.
A．the proportion of the reproductive age group
B．the influenza epidemic
C．advances in medical science
D．the Black Death in Europe
