题目内容
（请给出正确答案）
A. planted
B. was planted
C. were planted
D. will plant
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更多“ Thousands of trees over the m…”相关的问题
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.
Sequoyah was a young Cherokee Indian, son of a white trader and an Indian Squaw (北美印第安女人). At an early age, he became fascinated by "tile talking leaf", an expression that he used to describe the white man’s written records. Although many believe this "talking leaf" to be a gift from tile Great Spirit, Sequoyah refused to accept that theory. Like other Indians of tile period, he was illiterate, but his determination to remedy tile situation led to the invention of a unique 86 character alphabet based on the sound pat- terns that he heard.
His family and friends thought him mad, but while recuperating (恢复) from a hunting accident, he diligently and independently set out to create a form. of communication for his own people as well as for other Indians. In 1821, after twelve years of work, he had successfully developed a written language that would en- able thousands of Indians to read and write.
Sequoyah's desire to preserve words and events for later generation has caused him to be remembered among the important inventors. The giant redwood trees of California, called "sequoias (红杉)" in his honor, will further imprint his name in history.
What is the most important reason that Sequoyah will be remembered？ ()
A．California redwoods were named in his honor.
B．He was illiterate.
C．He created a unique alphabet.
D．He recovered from his madness and helped mankind.
ir complex ecology, naming, classification, and mapping have also become more particular, stressing what was actually present rather than postulating about climatic potential.
［B］ In regions of higher rainfall, such as eastern Africa, savanna vegetation is maintained by periodic fires. Consuming dry grass at the end of the rainy season, the fires burn back the forest vegetation, check the invasion of trees and shrubs, and stimulate new grass growth.
［C］ Once, as with the scientific treatment of African soils, a much greater uniformity was attributed to the vegetation than would have been generally accepted in the same period for treatments of the lands of western Europe or the United States.
［D］ The vegetational map of Africa and general vegetation groupings used here follow the White map and its extensive annotations.
［E］ African vegetation zones are closely linked to climatic zones, with the same zones occurring both north and south of the equator in broadly similar patterns. As with climatic zones, differences in the amount and seasonal distribution of precipitation constitute the most important influence on the development of vegetation.
［F］ Nevertheless, in broad terms, climate remains the dominant control over vegetation. Zonal belts of precipitation, reflection latitude and contrasting exposure to the Atlantic and Indian oceans and their currents, give some reality to related belts of vegetation.
［G］ The span of human occupation in Africa is believed to exceed that of any other continent. All the resultant activities have tended, on balance, to reduce tree cover and increase grassland; but there has been considerable dispute among scholars concerning the natural versus human-caused development of most African grasslands at the regional level.
回答题:
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回答第19题。 查看材料
A.see
B.know
C.ask
D.answer
There are ________ no trees in this poor area.
A.hardly
B.nearly
C.mostly
D.almost
Why there are fewer plants, trees and flowers in Holland now？
A．Because there has been a lot of pollution there.
B．Because there was a shortage of water.
C．Because many plants, trees and flowers have been destroyed.
D．Because Holland does not need so many plants, trees and flowers.
A.There is many trees in the street
B.There are many trees in the street
C.There are many tree in the street
