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[单选题]

Seeds remain dormant in the earth during winter.（)

A.impossible

B.unanimated

C.irritant

D.unpleasant

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发布时间：2022-06-07

更多“Seeds remain dormant in the earth during winter.()”相关的问题

第1题

听力原文： Most rain forests lie close to the equator, where the climate is often mild a

nd there are long hours of sunshine. The warmth of the land heats the air above, causing it to rise and tiny drops of water to fall as rain. The rainfall can reach at least 98 inches a year. This wet, warm world with plenty of sunlight is perfect for plants to grow, so the trees grow fast with green leaves all the year round. The trees themselves also have an effect on the climate. They gather water from the soil and pass it out into the air through their leaves. The wet air then forms clouds, which hang over the tree tops like smoke. These clouds protect the forest from the daytime heat and nighttime cold of nearby deserts, keeping temperatures fit for plant growth. Rain forests slightly farther away from the equator remain just as warm, but they have a dry season of three months or more when little rain falls. Tree leaves fall during this dry season and new leaves grow when the wet season or monsoon(rainy season)begins. Thus these areas are known as the "monsoon forest". Another type of rain forest grows on tropical mountains. It is often called the "cloud forest" because clouds often hang over the trees like fog. The rain forest is the ideal place for the growth of many different trees. Most of them depend on animals to eat their fruits and spread their seeds. When the fruits are eaten, the seeds inside them go undamaged through the animals stomachs and are passed out in their droppings. The seeds lying on the forest floor then grow into new trees. Questions 19 to 21 are based on the passage you have just heard. 19. What do we know about the climate of the rain forests near the equator？ 20. What can we learn from the passage？ 21. Which plays the most important role in the spreading of seeds according to the passage？20．

A．Tree leaves are green all the time in the monsoon forest.

B．There is a dry season in the cloud forest on tropical mountains.

C．Clouds help the plants in the rain forest near the deserts to grow.

D．The formation of climate in the rain forest has little to do with the trees.

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第2题

Anyone planning to go camping or hiking should first learn to recognize poison ivy,【B1】thi

s plant can cause a rash resulting in reddened skin, an annoying itch, and painful blisters. A severe【B2】can even force a person to remain in bed or become hospitalized. The best way to【B3】these discomforts is to avoid the plant.

Fortunately this plant is easy to【B4】. Whether it grows as a bush or a vine, the shape of its leaves is always【B5】. Each leaf stalk has three glossy leaves, usually with jagged edges. In early spring the leaves are red,【B6】green later. Then in autumn, the leaves【B7】to fresh red or orange. The poison ivy plant is found【B8】everywhere in North America. Because many birds eat its berries, its seeds are【B9】distributed. The plant loves the sun and flourishes along beaches, in fields, and by roadsides. It also grows【B10】in light shade and is often found in parks and pine forests. However, in thick woods the story is【B11】. It is not【B12】there. That is because the leaves of the trees block out the sun,【B13】the plant needs to grow.

The poison in poison ivy is in the form. of an oil that is in all parts of the plant. It is extremely【B14】. Merely touching the plant is enough contact for a person to be infected by the【B15】. Touching clothing or shoos that have brushed against the plant can also cause a rash and blisters. Even the smoke from a fire【B16】poison ivy is burning can cause the skin poisoning.

A person who makes【B17】with the plant should wash all infected areas with a strong laundry soap as soon as possible. Clothes that have come in contact with the【B18】should be dry cleaned or washed in soap and water. There is one good way to prevent the【B19】.【B20】away from the plant!

【B1】

A．since

B．so

C．therefore

D．then

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第3题

The word "dormant" in the third paragraph most probably means ______.A．deadB．ever-presentC

The word "dormant" in the third paragraph most probably means ______.

A．dead

B．ever-present

C．inactive

D．potential

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第4题

What does the word "dormant" in the third paragraph most probably mean？A．Dead.B．Ever-prese

What does the word "dormant" in the third paragraph most probably mean？

A．Dead.

B．Ever-present.

C．Inactive.

D．Potential.

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第5题

Volcanic fire and glacial ice are natural enemies. Eruptions at glaciated volcanoes typica

lly destroy ice fields, as they did in 1980 when 70% of Mount Saint Helens ice cover was demolished. During long dormant intervals, glaciers gain the upper hand cutting deeply into volcanic cones and eventually reducing them to rabble. Only rarely do these competing forces of heat and cold operate in perfect balance to create a phenomenon such as the steam caves at Mount Rainier National Park.

Located inside Rainier's two ice-filled summit craters, these caves form. a labyrinth of tunnels and vaulted chambers about one and one-half miles in total length. Their creation depends on an unusual combination of factors that nature almost never brings together in one place. The cave making recipe calls for a steady emission of volcanic gas and heat, a heavy annual snowfall at an elevation high enough to keep it from melting during the summer, and a bowl-shaped crater to hold the snow.

Snow accumulating yearly in Rainier's summit craters is compacted and compressed into a dense form. of ice called firn, a substance midway between ordinary ice and the denser crystalline ice that makes up glaciers. Heat rising from numerous openings (called fumaroles) along the inner crater walls melts out chambers between the rocky walls and the overlying ice pack. Circulating currents of warm air then melt additional opening in the firn ice, eventually connecting the individual chambers and, in the larger of Rainier's two craters, forming a continuous passageway that extends two-thirds of the way around the crater's interior.

To maintain the cave system, the elements of fire under ice must remain in equilibrium. Enough snow must fill the crater each year to replace that melted from below. If too much volcanic heat is discharged, the crater's ice pack will melt away entirely and the caves will vanish along with the snow of yesteryear. If too little heat is produced, the ice, replenished annually by winter snowstorms, will expand, pushing against the enclosing crater walls and smothering the present caverns in solid firn ice.

What topic is the passage mainly concerned with？

A．The importance of snowfall for Mount Rainier.

B．The steam caves of Mount Rainier.

C．How ice covers are destroyed.

D．The eruption of Mount Saint Helens in 1980,

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第6题

Directions : There are 20 blanks in the following passage. For each blank there are four c

hoices marked A, B, C and D on the right side of the paper. You should choose the ONE that best fits into the passage. Then mark the corresponding letter on Answer Sheet 2 with a single line through the centre.

In recent years a new farming revolution has begun, one that involves the 1 of life at a fundamental level -- the gene. The study of genetics has 2 rise to a new industry calledBiotechnology. As the name suggests, it 3 biology and modern technology through such techniques as genetic engineering. Some of the new biotech companies specialize in agriculture and are working feverishly to 4 seeds that give a high yield, that 5 diseases, drought and frost, and that reduce the need for 6 chemicals. If such goals could be achieved, it would be most 7 . But some have raised concerns about genetically engineered crops.

In nature, genetic diversity is created within certain 8 ．A rose can be crossed with a different kind of rose，but a rose will never cross with a potato．Genetic engineering，on the other hand，usually 9 taking genes from one species and inserting them into another in a(n) 10 to transfer a desired characteristic．This could mean，for example，selecting a gene which leads to the production of a chemical with antifreeze 11 from an arctic fish，and inserting it into a potato or strawberry to make it frost—resistant．In 12 ，then，biotechnology allows humans to 13 the genetic walls that separate species．

Like the green revolution， 14 some call the gene revolution contributes to the problem of genetic uniformity—some say even more so 15 geneticists Can employ techniques such as cloning and 16 culture，processes that produce perfectly 17 copies．Concerns about the erosion of biodiversity，therefore，remain：Genetically altered plants，however，raise new 18 ， such as the effects that they may have on us and the environment．“We are flying blindly into a new 19 of agricultural biotechnology with high hopes，few constraints，and little idea of the potential 20 。”said science writer Jeremy Rifkin．

第 32 题

A．manufacture

B．management

C．manipulation

D．maturity

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第7题

The word "dormant" （Line 4, Para. 5) means______.A．hiddenB．inactiveC．potentialD．devil

The word "dormant" (Line 4, Para. 5) means______.

A．hidden

B．inactive

C．potential

D．devil

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第8题

Many plants he dormant throughout the whole winter.A．temporally inactiveB．sleepingC．uncons

Many plants he dormant throughout the whole winter.

A．temporally inactive

B．sleeping

C．unconscious

D．brown

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第9题

他将尽力唤醒他们那些昏睡懒散的器官。(dormant and sluggish)

他将尽力唤醒他们那些昏睡懒散的器官。（dormant and sluggish)

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第10题

Plants in Desert Only special plants can survive the terrible climate of a desert, for the

Plants in Desert

Only special plants can survive the terrible climate of a desert, for these are regions when the annual range of the soil temperature can be over 75℃. Furthermore, during the summer there are few clouds in the sky to protect plans from the sun' s ray. Another problem is the fact that there are frequently strong winds that drive small, sharp particles of sand into the plants,earing and damaging them. The most difficult probiem for all forms of plant life, however, is the fact that the entire annual rainfall occurs during a few days or weeks in spring.

Grasses and flowers in desert survive from one year to the next by existing through the long, hot, dry season in the form. of seeds. These seeds remain inactive unless the fight amount of'rain falls. If no rain falls, or if insufficient rain falls, they wait until the next year, or even still the next. Another factor that helps these plants to survive is the fact that their life cycles are short. By the time the water from the spring rains disappears — just a few weeks after it falls — such plants no longer need any.

The perennials (多年生植物) have special features that enable them to survive as plants for several years. Thus, nearly all desert perennials have extensive root systems below ground and a small shoot system above ground. The large root network enables the plant to absorb as much water as possible in short time. The small shoot system, on the other hand, considerably limits water loss by evaporation.

Another feature of many perennials is that after the rainy season they 10se their leaves in preparation for the long, dry season, just as trees in wetter climates lose theirs in preparation for the winter. This reduces their water loss by evaporation (蒸发) duing the dry season. Then, in next rainy season, they come fully alive once more, and grow new branches, leaves and flowers, just as the grasses and flowers in desert do.

Ordinary plants are unable to survive in the desert mainly because of the changeable weather.

A．Right

B．Wrong

C．Not mentioned

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