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题目列表(包括答案和解析)

阅读理解

　　What will power your house in the future? Nuclear, wind, or solar power? According to scientists at the Massachusetts Institute of Technology(MIT)in the US, it might be leaves－but man-made ones．

　　Natural leaves are able to change sunlight and water into energy．It is known as photosynthesis(光合作用)．Now researchers have found a way to copy this seemingly simple process．

　　The man-made leaf developed by Daniel Nocera and his partners at MIT can be seen as a special chip with catalysts(催化剂)．Similar to natural leaves, it can split water into hydrogen and oxygen when put into a bucket of water．The hydrogen and oxygen gases are then stored in a fuel cell(电池), which uses those two materials to produce electricity．

　　A man-made leaf is not a new idea．The first man-made leaf was invented in 1997 but was too expensive and changeable for practical use．The new leaf, on the contrary, is made of cheap materials, easy to use and highly stable．In laboratory studies, Nocera showed that a man-made leaf prototype(原型)could operate continuously for at least 45 hours without a drop in activity．

　　The wonderful improvements come from Nocera’s recent discovery of several powerful, new, inexpensive catalysts．These catalysts make the energy change inside the leaf more efficient with water and sunlight．Right now, the new leaf is about 10 times more efficient at carrying out photosynthesis than a natural one．Besides, the machine can run in whatever water is available; that is, it doesn’t need pure water．This is important for some countries that don’t have enough pure water．

　　With the goal to “make each home its own power station” and “giving energy to the poor”, scientists believe that the new machine could be widely used in developing countries, especially in India and rural China．

(1)

What will give power to our house in the future, according to MIT?
[　　]
A．	Man-made leaves．
B．	Nuclear．
C．	Solar power．
D．	Wind．

(2)

Which of the following orders correctly shows how the man-made leaf is used to produce electricity? a．man-made leaves split water into hydrogen and oxygen b．the hydrogen and oxygen gases are stored in a fuel cell c．the man-made leaves are put in water d．the fuel cell uses hydrogen and oxygen to produce electricity
[　　]
A．	cbad．
B．	bcad．
C．	cabd．
D．	cadb．

(3)

What does the underlined “stable” in the 4^th paragraph mean?
[　　]
A．	Secure．
B．	Powerful．
C．	Unnatural．
D．	Unchangeable．

(4)

The aim of the scientists at MIT in developing the new man-made leaves is to ________．
[　　]
A．	build up more power stations in the world
B．	provide cheaper energy for developing countries
C．	offer people in developing countries access to pure water
D．	gain a deeper understanding of the photosynthesis process

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阅读理解

　　The debate around nuclear power is coming to a head and many questions are being asked．However, the suggestion that nuclear power is somehow uneconomic does not match the facts．

　　The famous Guardian stated that “the most obvious objection is cost：nuclear power is expensive, especially when compared with gas”．However, most international studies show that nuclear can compete with gas-even before the carbon costs are taken into consideration．It is also worth noting that most of these studies were completed before gas prices went up 4 times．Nuclear produces electricity at a predictable cost, so the use of it has the advantage over fossil-fuel(矿物燃料)costs and carbon price instability．The current strength of gas and coal prices simply increases that economic case．

　　Experience in Finland and France has proven that the costs of building and operating a new generation of nuclear power stations can be borne by the private sector(部门)．Similarly, if the UK chooses nuclear new-build, there will be no call on the taxpayer's purse and no need for a subsidy from government．

　　In addition, there is no need to change the regulations and laws that keep the nuclear industry safe．Simplifying the process of carrying out these controls, and more resources for those enforcing them, is all that is necessary．This will reduce uncertainty and delay, benefiting wind farms and gas storage construction as much as nuclear power．

　　Building a nuclear power plant is not cheap．But this does not mean that nuclear power is more expensive than other generation technologies．When combined with the fact that it produces reliable, low cost electricity without giving off carbon dioxide, it has a clear role in the UK's future generation mix．Let us be guided by today's knowledge rather than yesterday's dogma(教条)when we develop Britain's future energy resource．

(1)

The best title for this passage could be ________．
[　　]
A．	How to Build a Nuclear Power Station
B．	Nuclear Energy is Cheaper than Gas and Coal
C．	The Benefit of Using Nuclear Energy
D．	How to Make Full Use of Nuclear Energy

(2)

We are most likely to read the passage in ________．
[　　]
A．	a tour-booklet offered by a nuclear-power station
B．	a governmental report about the energy policy
C．	a commentary article in a public newspaper
D．	an advertisement about the use of the nuclear energy

(3)

Which of the following is true about the new generation of nuclear power station?
[　　]
A．	It can only be built by the private sector rather than the government．
B．	It has been built and operated everywhere in France and Finland．
C．	The government just needs to change a few laws and regulations．
D．	The building of it doesn't need the government's support．

(4)

What does the underlined word “subsidy” mean according to the passage?
[　　]
A．	Governmental permission．
B．	Political support．
C．	Financial aid．
D．	Public discussion．

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What will power your house in the future? Nuclear, wind, or solar power? According to scientists at the Massachusetts Institute of Technology (MIT) in the US, it might be leaves –but artificial ones.
Natural leaves are able to change sunlight and water into energy. It is known as photosynthesis (光合作用). Now researchers have found a way to imitate this seemingly simple process.
The artificial leaf developed by Daniel Nocera and his colleagues at MIT can be seen as a special silicon chip (硅片) with catalysts (催化剂). Similar to natural leaves, it can split water into hydrogen and oxygen when put into a bucket of water. The hydrogen and oxygen gases are then stored in a fuel cell (电池), which uses those two materials to produce electricity, located either on top of a house or beside the house.
Though the leaf is only about the shape of a poker card, scientists claimed that it is promising to be an inexpensive source of electricity in developing countries. “One can imagine villages in India and Africa not long from now purchasing an affordable basic power system based on this technology,” said Docera at a conference of the American Chemical Society.
An artificial leaf is not a new idea. The first artificial leaf was invented in 1997 but was too expensive and unstable for practical use. The new leaf, by contrast, is made of cheap materials, easy to use and highly stable. In laboratory studies, Nocera showed that an artificial leaf prorotype (原型) could operate continuously for at least 45 hours without a drop in activity.
The wonderful improvements come from Nocera’s recent discovery of several powerful new, inexpensive catalysts. These catalysts make the energy transformation (转换) inside the leaf more efficient with water and sunlight. Right now, the new leaf is about 10 times more efficient at carrying out photosynthesis than a natural one. Besides, the device can run in whatever water is available; that is, it doesn’t need pure water. This is important for some countries that don’t have access to pure water.
With the goal to “make each home its own power station” and “giving energy to the poor”, scientists believe that the new application could be widely used in developing countries, especially in India and rural China.
【小题1】Which of the following order correctly shows how the artificial leaf is used to produce electricity?
a. artificial leaves split water into hydrogen and oxygen
b. the hydrogen and oxygen gases are stored in a fuel cell
c. the artificial leaves are put in water
d. the fuel cell uses hydrogen and oxygen to produce electricity

A．cbad

B．cabd

C．bcad

D．cadb

【小题2】Which of the following statements about new artificial leaves is TRUE according to the article?

A．They are inexpensive but unstable.

B．They are as efficient at carrying out photosynthesis as natural leaves.

C．They can work only in pure water.

D．They need several catalysts to help them work efficiently.

【小题3】The aim of the scientists at MIT in developing the new artificial leaves is to .

A．build-up more power stations in the world

B．provide cheaper energy for developing countries

C．offer people in developing countries access to pure water

D．gain a deeper understanding of the photosynthesis process

【小题4】What is the main point of the article?

A．Introduction to the history of artificial leaves.

B．An invention copying photosynthesis.

C．Giving energy to the poor.

D．A mixture of water power and solar energy.

查看答案和解析>>

Natural leaves are able to change sunlight and water into energy. It is known as photosynthesis (光合作用). Now researchers have found a way to imitate this seemingly simple process.

The artificial leaf developed by Daniel Nocera and his colleagues at MIT can be seen as a special silicon chip (硅片) with catalysts (催化剂). Similar to natural leaves, it can split water into hydrogen and oxygen when put into a bucket of water. The hydrogen and oxygen gases are then stored in a fuel cell (电池), which uses those two materials to produce electricity, located either on top of a house or beside the house.

Though the leaf is only about the shape of a poker card, scientists claimed that it is promising to be an inexpensive source of electricity in developing countries. “One can imagine villages in India and Africa not long from now purchasing an affordable basic power system based on this technology,” said Docera at a conference of the American Chemical Society.

An artificial leaf is not a new idea. The first artificial leaf was invented in 1997 but was too expensive and unstable for practical use. The new leaf, by contrast, is made of cheap materials, easy to use and highly stable. In laboratory studies, Nocera showed that an artificial leaf prorotype (原型) could operate continuously for at least 45 hours without a drop in activity.

The wonderful improvements come from Nocera’s recent discovery of several powerful new, inexpensive catalysts. These catalysts make the energy transformation (转换) inside the leaf more efficient with water and sunlight. Right now, the new leaf is about 10 times more efficient at carrying out photosynthesis than a natural one. Besides, the device can run in whatever water is available; that is, it doesn’t need pure water. This is important for some countries that don’t have access to pure water.

With the goal to “make each home its own power station” and “giving energy to the poor”, scientists believe that the new application could be widely used in developing countries, especially in India and rural China.

1.Which of the following order correctly shows how the artificial leaf is used to produce electricity?

a. artificial leaves split water into hydrogen and oxygen

b. the hydrogen and oxygen gases are stored in a fuel cell

c. the artificial leaves are put in water

d. the fuel cell uses hydrogen and oxygen to produce electricity

A. cbad B. cabd C. bcad D. cadb

2.Which of the following statements about new artificial leaves is TRUE according to the article?

A. They are inexpensive but unstable.

B. They are as efficient at carrying out photosynthesis as natural leaves.

C. They can work only in pure water.

D. They need several catalysts to help them work efficiently.

3.The aim of the scientists at MIT in developing the new artificial leaves is to .

A. build-up more power stations in the world

B. provide cheaper energy for developing countries

C. offer people in developing countries access to pure water

D. gain a deeper understanding of the photosynthesis process

4.What is the main point of the article?

A. Introduction to the history of artificial leaves.

B. An invention copying photosynthesis.

C. Giving energy to the poor.

D. A mixture of water power and solar energy.

查看答案和解析>>

What will power your house in the future? Nuclear, wind, or solar power? According to scientists at the Massachusetts Institute of Technology (MIT) in the US, it might be leaves –but artificial ones.
Natural leaves are able to change sunlight and water into energy. It is known as photosynthesis (光合作用). Now researchers have found a way to imitate this seemingly simple process.
The artificial leaf developed by Daniel Nocera and his colleagues at MIT can be seen as a special silicon chip (硅片) with catalysts (催化剂). Similar to natural leaves, it can split water into hydrogen and oxygen when put into a bucket of water. The hydrogen and oxygen gases are then stored in a fuel cell (电池), which uses those two materials to produce electricity, located either on top of a house or beside the house.
Though the leaf is only about the shape of a poker card, scientists claimed that it is promising to be an inexpensive source of electricity in developing countries. “One can imagine villages in India and Africa not long from now purchasing an affordable basic power system based on this technology,” said Docera at a conference of the American Chemical Society.
An artificial leaf is not a new idea. The first artificial leaf was invented in 1997 but was too expensive and unstable for practical use. The new leaf, by contrast, is made of cheap materials, easy to use and highly stable. In laboratory studies, Nocera showed that an artificial leaf prorotype (原型) could operate continuously for at least 45 hours without a drop in activity.
The wonderful improvements come from Nocera’s recent discovery of several powerful new, inexpensive catalysts. These catalysts make the energy transformation (转换) inside the leaf more efficient with water and sunlight. Right now, the new leaf is about 10 times more efficient at carrying out photosynthesis than a natural one. Besides, the device can run in whatever water is available; that is, it doesn’t need pure water. This is important for some countries that don’t have access to pure water.
With the goal to “make each home its own power station” and “giving energy to the poor”, scientists believe that the new application could be widely used in developing countries, especially in India and rural China.

1.
Which of the following order correctly shows how the artificial leaf is used to produce electricity?
a. artificial leaves split water into hydrogen and oxygen
b. the hydrogen and oxygen gases are stored in a fuel cell
c. the artificial leaves are put in water
d. the fuel cell uses hydrogen and oxygen to produce electricity
1. A.
  cbad
2. B.
  cabd
3. C.
  bcad
4. D.
  cadb
2.
Which of the following statements about new artificial leaves is TRUE according to the article?
1. A.
  They are inexpensive but unstable.
2. B.
  They are as efficient at carrying out photosynthesis as natural leaves.
3. C.
  They can work only in pure water.
4. D.
  They need several catalysts to help them work efficiently.
3.
The aim of the scientists at MIT in developing the new artificial leaves is to .
1. A.
  build-up more power stations in the world
2. B.
  provide cheaper energy for developing countries
3. C.
  offer people in developing countries access to pure water
4. D.
  gain a deeper understanding of the photosynthesis process
4.
What is the main point of the article?
1. A.
  Introduction to the history of artificial leaves.
2. B.
  An invention copying photosynthesis.
3. C.
  Giving energy to the poor.
4. D.
  A mixture of water power and solar energy.

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Which of the following statements about new artificial leaves is TRUE according to the article?

The aim of the scientists at MIT in developing the new artificial leaves is to .

What is the main point of the article?