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题目
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.
更多“第一篇 Putting Plants to Work Using the power of the sun is nothing new. People”相关的问题
第1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2题
A．Scientists Searching for Metals with Special Power
B．New Methods of Searching for Trees and Bushes
C．Gold Could Be Found by Trees and Plants
D．A New Method of Searching for Minerals: Using Trees and Plants
第3题
Wind power plants pay no property taxes and land rents.
A．Y
B．N
C．NG
第4题
A.the work of using lines and chains to secure the cargo on board
B.the lash work
C.the work of putting dunnage，keeping the cargo in position and not move when the ship is rolling and pitching
D.the lashing work
第5题
Actually, there are other ways to make electricity without burning fossil fuels. People have been using the power of wind for centuries. Wind power won't solve all our energy problems, but it can help meet some of the demands in certain places. Since the late 1800s, scientists have been working to turn the sun's energy into electricity by using solar cells (太阳能电池). The problem is, solar cells are very expensive. Another way to make electricity is to use nuclear energy. It has been used for more than 50 years. Today about 10 percent of all the electricity used in the U. S. A. comes from this source.
Although nuclear power doesn't pollute the air as the burning of fossil fuels does, there is a major drawback . The waste products from nuclear power plants are dangerous and must be stored in safe places. Many people are concerned about the safety of nuclear power.
The best title for this passage may be ______.
A．The Importance of Electricity
B．The Pollution of Making Electricity from Fossil Fuels
C．The Advantage of Using Nuclear Energy
D．Means of Making Electrical Power
第6题
Actually, there are other ways to make electricity without burning fossil fuels. People have been using the power of wind for centuries. Wind power won't solve all our energy problems, but it can help meet some of the demands in certain places. Since the late 1800s, scientists have been working to turn the sun's energy into electricity by using solar cells (太阳能电池). The problem is, solar cells are very expensive. Another way to make electricity is to use nuclear energy. It has been used for more than 50 years. Today about 10 percent of all the electricity used in the U. S. A. comes from this source.
Although nuclear power doesn't pollute the air as the burning of fossil fuels does, there is a major drawback . The waste products from nuclear power plants are dangerous and must be stored in safe places. Many people are concerned about the safety of nuclear power.
The best title for this passage may be ______.
A．The Importance of Electricity
B．The Pollution of Making Electricity from Fossil Fuels
C．The Advantage of Using Nuclear Energy
D．Means of Making Electrical Power
第7题
The author's "secret" is______.
A．to avoid using big words at any time
B．to use words that have the power to move people
C．to work a miracle by using a small word
D．to use small and simple words where possible
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