题目内容
（请给出正确答案）
Small plants like grasses and herbs are grown widely on intensive green roofs.
A．Right
B．Wrong
C．Not mentioned
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更多“Small plants like grasses and herbs are grown widely on intensive green roofs.A．RightB．Wro”相关的问题
Why was it possible for these ancient trees let more light through than modern ones？
A．Because they were closely spaced, only 3 to 16 feet apart.
B．Because they were smaller plants and shrubs.
C．Because their branches did not fan out as far as to form. a shape like umbrella.
D．Because they had very small leaves like that of fern and dropped easily.
听力原文： When the automobile was first invented, few people thought of buying one. Gradually, as cars were improved, more people wanted to buy them. Men tried to think of new and better ways to manufacture automobiles. Finally, Henry Ford set up a factory with an assembly line to produce automobiles.
Even with his new system of manufacturing the automobile industry remained fairly small. Almost all the assembly work was done in a few large factories near Detroit, Michigan. Then the cars were shipped to wholesalers all over the country. Wholesalers bought the cars from the factory and sold them to auto traders in each city. The traders then sold the cars to the people who wanted to buy them.
During the 1920s, this system began to change. The automobile industry had grown rapidly. Soon it was no longer practical to have assembly plants in Detroit only. New plants were built all over the country. With plants near each trader, the wholesaler' s job was unnecessary. The traders could buy cars directly from the factory.
Many other kinds of industries have moved their factories from the cities to small towns. In place of large factory, these companies now have several smaller plants. Like the automobile industry, they have found that many small factories can be more efficient than fewer large plants.
(34)
A．A factory with more automobiles.
B．A factory with improved cars.
C．A factory with an assembly line.
D．A factory with few people.
听力原文：M: So, what is your biology project about？
W: It is about microorganisms that…en, microorganisms that live by Chemosynthesis.
M: Ehm…what’s Chemosynthesis？
W: Well, it’s pretty complicated. You know how most life on Earth depends either directly or indirectly on sunlight？
M: You mean like plants get energy directly from sunlight, and animals eat plants, so they depend indirectly on sunlight？
W: Right. But down on the ocean floor, there is no sunlight. In some places though, there are hydrothermal vents, which are small cracks on the sea floor. And these vents release heat and minerals from the inside of the Earth into the seawater. And all along the vents there are these unusual microorganisms. They are called archaean. And these archaean use chemical reactions to get their energy from the minerals, the minerals that are released by the vents. So their energy comes from chemical reactions, not sunlight.
M: So chemosynthesis is getting their energy from chemicals？
W: That is right.
M: That makes archaean very different from other forms of life.
W: And their genetic makeup is very different too. They are one sort of organisms just like bacteria are, but genetically they are as different from bacteria as we humans are.
M: Waa, that’s a really interesting project.
(35)
A．How hydrothermal vents are formed.
B．How living things get energy from sunlight
C．The harmful effects of certain chemicals in the ocean.
D．Microorganisms that get energy from chemical reactions.
听力原文：M: What is your biology project about？
W: It is about microorganisms that microorganisms that live by Chemosynthesis.
M: Ehm what's Chemosynthesis？
W: Well, it's pretty complicated. You know how most life on Earth depends either directly or indirectly on sunlight？
M: You mean like plants get energy directly from sunlight, and animals eat plants, so they depend indirectly on sunlight？
W: Right. But down on the ocean floor, there is no sunlight. In some places though, there are hydrothermal vents, which are small cracks on the sea floor. And these vents release heat and minerals from the inside of the Earth into the seawater. And all around the vents there are these unusual microorganisms. They are called archaea. And these archaea use chemical reactions to get their energy from the minerals, the minerals that are released by the vents. So their energy comes from chemical reactions, not sunlight.
M: So ehemosynthesis is getting energy from chemicals？
W: That is right.
M: That makes archaea very different from other forms of life.
W: And their genetic makeup is very different too. They are one sort of organisms just like bacteria are, but genetically they are as different from bacteria as we humans are.
M: Waa, that's a really interesting project.
What is the woman's project mainly about？
A．How hydrothermal vents are formed.
B．How living things get energy from sunlight.
C．The harmful effects of certain chemicals in the ocean.
D．Microorganisms that get energy from chemical reactions.
听力原文：M: So, what is your biology project about？
W: It is about microorganisms that live by chemosynthesis.
M: Err...what's chemosynthesis？
W: Well, it's pretty complicated. You know how most life on Earth depends either directly or indirectly on sunlight？
M: You mean like plants get energy directly from sunlight, and animals eat plants, so they depend indirectly on sunlight？
W: Right. But down on the ocean floor, there is no sunlight. In some places though, there are hydrothermal vents, which are small cracks on the ocean floor. And these vents release heat and minerals from the inside of the Earth into the seawater. And all along the vents there are these unusual microorganisms. They are called archaean. And these archaean use chemical reactions to get their energy from the minerals. The minerals that are released by the vents. So their energy comes from chemical reactions, not sunlight.
M: So chemosynthesis is getting their energy from chemicals？
W: That's right.
M: That makes archaean very different from other forms of life.
W: And their genetic makeup is very different, too. They are one sort of organisms just like bacteria are, but genetically they are as different from bacteria as we humans are.
M: Wah, that's a really interesting project.
(23)
A．How hydrothermal vents are formed.
B．How living things get energy from sunlight.
C．The harmful effects of certain chemicals in the ocean.
D．Microorganisms that get energy from chemical reactions.
What is the main idea of the second paragraph？
A．Some plants have relative immunity to a great many diseases, while others have a susceptibility to them.
B．The tolerance of a particular plant changes as the growing conditions change.
C．A blight killed virtually every chestnut tree in North America.
D．A blight may be a national infection.
听力原文：W: Hi, Tom.
M: Kate, I haven't seen you for weeks. Where have you been？
W: In Florida.
M: What？ Vacationing while the rest of us have been studying on the campus in the February cold？
W: Not exactly. I spent most of my time underwater.
M: I don't understand.
W: I was on a special field trip. I went with my marine biology class.
M: So you went scuba diving. What were you looking for, sunken treasure？
W: You might say so. The sea is full of treasures. All kinds of strange, fascinating organisms. Our class concentrated on studying plankton.
M: I thought they were too small to be seen.
W: That's a common misconception. The plankton covers a wide variety of freely floating plants and animals. From one-celled organisms to large ones, such as the common jelly fish.
M: Jelly-fish may be large enough to be seen. But they are transparent, aren't they？
W: Yes, most floating plants and animals have transparent tissues. It makes them practically invisible to their enemies.
M: But not invisible to your biology class, I hope.
W: By concentrating, I was able to see the outlines of lots of different plants and animals, In fact, our professor even took photo of some small oceanic snails.
M: How would the snails show up in the photo if they are transparent？
W: We painted them with a harmless green dye. Since particles of the dye stuck to the tissues, the snails appeared in a green outline in the photos.
M: That sounds like an interesting trip.
W: It really was.
M: But I think if I had been there, I'd much rather have spent my time just swimming and lying in the sun.
(20)
A．Sightseeing.
B．Lying on the beach.
C．Taking photos of the beaches.
D．Scuba diving.
David Salt is an expert on plants at Purdue University in West Lafayette, Indiana. He is working with plants that store large amounts of metals.
In recent years, scientists have shown interest in using such plants to clean up harmful waste materials. Professor Salt says such plants also could be used to improve people's diets or even to create foods that fight cancer.
Humans need a number of metals in their diets, including iron and zinc. These metals are needed in very small amounts, however. That is why they are called micronutrients. The lack of micronutrients is blamed for health problems in many developing countries. Children and pregnant women are mostly affected.
Recently, Mr. Salt announced that he has identified and copied the genes from a kind of plant that stores metals in its tissues. He says his study suggests it may be possible to develop plants that contain minerals needed for good health.
For example, the metal selenium is a strong anti-cancer agent. Some wild plants store selenium naturally. Mr. Salt says foods to fight cancer might be created if genes from these plants could be moved into crop plants.
Locoweed, which is a common plant in the western U.S., stores selenium. Professor Salt says it may be possible to create cancer-fighting foods from it. He and scientists from a company called Unicycle Therapies have copied the gene that causes locoweed to take up selenium from the soil.
Many people take pills to add important minerals or vitamins to their diet. However, Mister Salt notes that most selenium products sold in health food stores are of little use. That is because the human body can only take in and use selenium if it is in the right chemical form.
The scientist says his team would like to develop a vegetable crop high in selenium. He wants to create an anti-cancer product in the foods we already eat.
According to Pro. Salt, plants that take up large amounts of metal in their tissues can be used to ______.
A．clean polluted soil and cure disease like cancer
B．clean up harmful waste materials in soil and improve people's diet
C．produce large number of micronutrients such as iron and zinc
D．create food with important minerals or vitamins
During the course of a day, the boilers at one of our power plants, Morgantown, for example, can turn 24 million gallons of water into steam. That generating plant alone uses 9,900 tons of coal in its furnaces in just one day. Potomac Electric Power Company (PEPCO) uses so much coal that we have purchased two 80-car unit trains to facilitate the delivery process. And Morgantown alone can produce over 25 million kilowatthours of electricity in a single day's operation.
Electricity is produced by spinning large magnets inside a coil of wire within the generator. The faster we spin the magnets, the higher will be the voltage of the electricity produced. Electricity leaves a PEPCO generator at between 13,800 and 24,000 volts.
The next step in the process occurs when electricity passes through a transformer where the voltage is stepped up to continue on its journey. A transmission wire is like a small diameter pipe. Stepping up the voltage is like increasing water pressure, thus speeding the flow of energy through the system.
Life is everywhere around us. It is evident in the huming of 【1】______
insects, the singing of birds, the rustlings of small animals in the
underbrush. It exists in the icy polar regions and in patched deserts.【2】______
It is present from the sea's sunlit surface to its darkest depths. High
in the atmosphere tiny creatures float about. Beneath our feet untold
trillion of microorganisms are 【3】______
on work in the soil, making it fertile for the growing of green 【4】______
plants, which sustain the other forms of life. 【5】______
Earth is packed with life so abundant and varied as to
staggering the imagination. How did it all start？ This planet of ours【6】______
and all inhabitants—how did they come to be here？ More 【7】______
particularly, how did humankind get started？ Did we evolve from
apelike animals？ And were we created？ Just how did we get here？ 【8】______
And what does the answer infer for the future？ Questions like these【9】______
have been around for a long time and they still unanswered in the 【10】______
minds of many.
【M1】
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