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A.the energy to turn a turbine
B.impermeable rock
C.one or two separators
D.turbine operator
E.little or no water
F.hot springs
答案
更多“Flash plants produce hot water through”相关的问题
第1题
What of the folloWing about methane is Not menttoned in the passage？
A．Plants grOWing in soilrelease methane．
B．Plants growing in water release methane．
C．Soil micmbes consume methane．
D．Microbes in plants produce methane．
第2题
请根据以下内容回答1-5题
Putting Plants to Work
Using the power of the sun is nothing new. People have had solar-powered calculators and buildings with solar panels
for decades. But plants are the real experts: They've been using sunlight as an energy source for billions of years.
Cells in the green leaves of plants work like tiny factories to convert sunlight, carbon dioxide, and water into sugars
and starches, stored energy that the plants can use. This conversion process is called photosynthesis. Unfortunately,
unless you're a plant, it's difficult and expensive to convert sunlight into storable energy. That's why scientists are
taking a closer look at exactly how plants do it.
Some scientists are trying to get plants, or biological cells that act like plants, to work as miniature photosynthetic
power stations. For example, Maria Ghirardi of the National Renewable Energy Laboratory in Golden, Colo.,
is working with green algae. She's trying to trick them into producing hydrogen instead of sugars when they
perform photosynthesis. Once the researchers can get the algae working efficiently, the hydrogen that they
produce could be used to power fuel cells in cars or to generate electricity.
The algae are grown in narrow-necked glass bottles to produce hydrogen in the lab. During photosynthesis,
plants normally make sugars or starches. “But under certain conditions, a lot of algae are able to use the
sunlight energy not to store starch, but to make hydrogen.” Ghirardi says. For example, algae will produce
hydrogen in an airfree environment. It's the oxygen in the air that prevents algae from making hydrogen most
of the time. Working in an airfree environment, however, is difficult. It's not a practical way to produce cheap
energy. But Ghirardi and her colleagues have discovered that by removing a chemical called sulfate from the
environment that the algae grow in, they will make hydrogen instead of sugars, even when air is present.
Unfortunately, removing the sulfate also makes the algae's cells work very slowly, and not much hydrogen is
produced. Still, the researchers see this as a first step in their goal to produce hydrogen efficiently from algae.
With more work, they may be able to speed the cells' activity and produce larger quantities of hydrogen.
The researchers hope that algae will one day be an easy-to-use fuel source. The organisms are cheap to get and
to feed, Ghirardi says, and they can grow almost anywhere:
“You can grow them in a reactor, in a pond. You can grow them in the ocean. There's a lot of flexibility in
how you can use these organisms. ”
What does the writer Say about plants concerning solar energy？_______
A Plants are the real experts in producing solar energy.
B Plants have been used to produce solar energy.
C Plants have been using solar energy for billions of years.
D Plants have been a source of solar energy.
第3题
By saying "they employ chemical warfare" (Line 4, Para. 2), Bruce Ames means "______".
A．plants produce certain chemicals to combat pests and diseases
B．plants absorb useful chemicals to promote their growth
C．farmers use manmade chemicals to dissolve the natural chemicals in plants
D．farmers use chemicals to protect plants against pests and diseases
第4题
By saying "they employ chemical warfare" (Line 4, Para. 2), Bruce Ames means______.
A．plants produce certain chemicals to combat pests and diseases
B．plants absorb useful chemicals to promote their growth
C．farmers use man-made chemicals to dissolve the natural chemicals in plants
D．farmers use chemicals to protect plants against pests and diseases
第5题
Why do some scientists study how plants convert sunlight carbon dioxide, and water into sugars and starches？ _______A Because they want algae to produce sugars and starches.B Because they want green plants to become a new source of energy.C Because they want to turn plant sugars to a new form of energy.D Because they want to make photosynthesis more efficient.
第6题
第一篇 Putting Plants to Work
Using the power of the sun is nothing new. People have had solar-powered calculators and buildings with solar panels(太阳能电池板) for decades. But plants are the real experts. They’ve been using sunlight as an energy source for billions of years.
Cells in the green leaves of plants work like tiny factories to convert sunlight, carbon dioxide(二氧化碳), and water into sugars and starches(淀粉), stored energy that the plants can use. This conversion process is called
photosynthesis(光合作用). Unfortunately, unless you’re a plant, it’s difficult and expensive to convert sunlight into storable energy. That’s why scientists are taking a closer look at exactly how plants do it.
Some scientists are trying to get plants or biological cells that act like plants, to work as very small photosynthesis power stations. For example, Maria Ghirardi of the National Renewable Energy Laboratory in Golden. Colo., is working with green algae(水藻). She’s trying to trick them into producing hydrogen instead of sugars when they perform. photosynthesis. Once the researchers can get the algae working efficiently the hydrogen that they produce could be used to power fuel cells in cars or to generate electricity.
The algae are grown in narrow-necked glass bottles to produce hydrogen in the lab. During photosynthesis, plants normally make sugars or starches. “But under certain conditions, a lot of algae are able to use the sunlight energy not to store starch, but to make hydrogen.” Ghirardi says. For example, algae will produce hydrogen in an airfree environment. It’s the oxygen in the air that prevents algae from making hydrogen most of the time.
Working in an airfree environment, however, is difficult. It’s not a practical way to produce cheap energy. But Ghirardi and her colleagues have discovered that by removing a chemical called sulfate(硫酸盐) from the environment that the algae grow in, they will make hydrogen instead of sugars, even when air is present.
Unfortunately, removing the sulfate also makes the algae's cells work very slowly, and not much hydrogen is produced. Still, the researchers see this as a first step in their goal to produce hydrogen efficiently from algae. With more work, they may be able to speed the cells’ activity and produce larger quantities of hydrogen.
The researchers hope that algae will one day be an easy-to-use fuel source. The organisms are cheap to get and to feed, Ghirardi says, and they can grow almost anywhere: “You can grow them in a reactor, in a pond. You can grow them in the ocean. There’s a lot of flexibility in how you can use these organisms.”
31 How do plants relate to solar energy？
A They have been using it for billions of years.
B They are the real experts in producing it.
C They have been a source of it.
D They have been used to produce it.
第7题
听力原文： Scientists have discovered that plants themselves produce many poisonous chemicals for defense against insects. But insects have developed ways of dealing with them and, in fact, have been eating plants for about 250 million years. Now insects are using these same mechanisms to deal with man-made poisons—insecticides. This is why resistance of insects to insecticides has developed so rapidly.
What should be done？ Scientists studying the problem suggest that farmers use less insecticides. At the moment, farmers regularly spray crops as a precaution against problems that are caused by large numbers of pests. They should, instead, spray only where pests have actually been seen. Secondly, farmers could use a combination of two or three insecticides at once. To survive, the insects would need to become resistant to two or more insecticides at the same time.
The most surprising suggestion, perhaps, is that at certain times of the year, farmers should actually try to attract insects onto the crops they are trying to protect. The new insects will mate with those which survived from a certain kind of insecticide and will lessen the latter's resistance to it.
Scientist hope that these and other measures will postpone the day when farmers and scientists will have to stand by while new super-bugs which may be resistant to all poisons invade our farms and devour our crops.
What have scientists discovered about plants and insects？
A．Plants produce many poisonous chemicals for defense against insects.
B．Insects develop ways of dealing with natural poisonous chemicals but not man-made ones.
C．Farmers must spray plants all the time.
D．Farmers must use different brands of insecticides.
第8题
Which of the following about methane is Not mentioned in the passage？
A．Plants growing in soil release methane.
B．Plants growing in water release methane.
C．Soil microbes consume methane.
D．Microbes in plants produce methane.
第9题
请根据短文内容，回答题。
Putting Plants to Work
Using the power of the sun is nothing new. People have had solar-powered calculators and buildings with solar panels (太阳能电池板) for decades. But plants are the real experts. They&39;ve been using sunlight as an energy source for billions of years.＜br＞
Cells in the green leaves of plants work like tiny factories to convert sunlight, carbon dioxide(二氧化碳), and water into sugars and starches(淀粉 ), stored energy that the plants can use. This conversion process is called photosynthesis (光合作用 ) . Unfortunately, unless you&39;re a plant, it&39;s difficult and expensive to convert sunlight into storable energy. That&39;s why scientists are taking a closer look at exactly how plants do it.＜br＞
Some scientists are trying to get plants, or biological cells that act like plants, to work as very small photosynthesis power stations. For example, Maria Ghirardi of the National Renewable Energy Laboratory in Golden, Colo, is working with green algae (水藻). She&39;s trying to trick them into producing hydrogen instead of sugars when they perform. photosynthesis. Once the researchers can get the algae working efficiently, the hydrogen that they produce could be used to power fuel cells in cars or to generate electricity.＜br＞
The algae are grown in narrow-necked glass bottles to produce hydrogen in the lab. During photosynthesis, plants normally make sugars or starches. "But under certain conditions, a lot of algae are able to use the sunlight energy not to store starch, but to make hydrogen," Ghirardi says.＜br＞
For example, algae will produce hydrogen in an airfree environment. It&39;s the oxygen in the air that prevents algae from making hydrogen most of the time.＜br＞
Working in an airfree environment, however, is difficult. It&39;s not a practical way to produce cheap energy. But Ghirardi and her colleagues have discovered that by removing a chemical called sulfate (硫酸盐) from the environment that the algae grow in, they will make hydrogen instead of sugars, even when air is present.＜br＞
Unfortunately, removing the sulfate also makes the algae&39;s cells work very slowly, and not much hydrogen is produced. Still, the researchers see this as a first step in their goal to produce hydrogen efficiently from algae. With more work, they may be able to speed the cells&39; activity and produce larger quantities of hydrogen.＜br＞
The researchers hope that algae will one day be an easy-to-use fuel source. The organisms are cheap to get and to feed, Ghirardi says, and they can grow almost anywhere: "You can grow them in a reactor, in a pond. You can grow them in the ocean. There&39;s a lot of flexibility in how you can use these organisms."＜
How do plants relate to solar energy？ 查看材料
A.They are the real experts in producing it
B.They have been a source of it
C.They have been used to produce it
D.They have been using it for billions of years
第10题
A．they can be of great help to the protection of environment
B．it is more expensive to process wastes in a farther dump
C．they can make the wastes into something that is useful
D．they can produce a lot of energy for the local residents
