任务型填空。 People who are concerned about pollution will be happy to know that c
题型：0110 期中题难度：来源：
that protect the environment such as solar energy are becoming possible alternatives.
Increasing demand for clean, renewable energy is driving a growing market for solar energy products..
Two of the main types of products that take advantage of solar energy are passive and active solar products.
These two types of systems differ in how they are constructed and can also differ greatly in cost. Passive solar
technology can be used to heat air or water directly using the sun"s energy. Unlike an active solar application,
passive solar set-ups accomplish their task without the use of additional electrical components, such as fans
that need an external electricity supply. Some solar space heating or water heating systems are active solar
heating systems that have various components that call for external power sources. Because of their simplicity
compared with active systems, passive solar heating systems generally are cheaper than active ones.
In addition to these solar heating systems, there are also solar power system available. Rather than using the
sun"s energy for heating applications, these systems change solar energy into electricity. An important part of
these products is called photovoltaic cells, which generate electricity from light. As sunlight falls on a
photovoltaic cell, the light"s energy is changed into electricity that can then be used to power many kinds of
electronic devices. Because of the complicated technology involved, these kinds of solar power systems can
be very expensive.
When considering what kind of solar heating or power system to install (安装) in your home or business,
be sure to purchase your equipment from a reputable manufacturer who will be able to help you with any
necessary repair.
Solar energy application 
答案
6.higher 7.Examples 8.electricity 9.Advice 10.repair
举一反三
Batteries can power anything from small sensors to large systems. While scientists are finding ways to
make them smaller but even more powerful, problems can arise when these batteries are much larger and
heavier than the devices themselves. University of Missouri(MU) researchers are developing a nuclear energy
source that is smaller, lighter and more efficient.
"To provide enough power, we need certain methods with high energy density (密度)", said Jae Kwon,
assistant professor of electrical and computer engineering at MU. "The radioisotope (放射性同位素) battery
can provide power density that is much higher than chemical batteries."
Kwon and his research team have been working on building a small nuclear battery, presently the size and
thickness of a penny, intended to power various micro / nanoelectromechanreal systems (M/NEMS). Although
nuclear batteries can cause concerns, Kwon said they are safe.
"People hear the word "nuclear" and think of something very dangerous," he said, "However, nuclear power
sources have already been safely powering a variety of devices, such as pace-makers, space satellites and
underwater systems."
His new idea is not only in the battery"s size, but also in its semiconductor (半导体). Kwon"s battery uses
a liquid semiconductor rather than a solid semiconductor.
"The key part of using a radioactive battery is that when you harvest the energy, part of the radiation energy
can damage the lattice structure (晶体结构) of the solid semiconductor," Kwon said, "By using a liquid semicon
ductor, we believe we can minimize that problem."
Together with J. David Robertson, chemistry professor and associate director of the MU Research Reactor,
Kwon is working to build and test the battery. In the future, they hope to increase the battery"s power, shrink
its size and try with various other materials. Kwon said that battery could be thinner than the thickness of
human hair.
B. He developed a chemical battery.
C. He is working on a nuclear energy source.
D. He made a breakthrough in computer engineering.
B. to introduce nuclear batteries can be safely used.
C. to describe a nuclear-powered system.
D. to introduce various energy sources.
B. test the power of nuclear batteries
C. decrease the size of nuclear batteries
D. reduce the damage to lattice structure
B. test the power of nuclear batteries
C. decrease the size of nuclear batteries
D. reduce the damage to lattice structure
B. book review
C. newspaper ad
D. science fiction story
like a fat chicken, eats green leaves, has the stomach of a cow and has claws (爪) on its wings when young.
They build their homes about 4.6m above the river, an important feature (特征) for the safety of the young.
It is called the hoatzin.
In appearance, the birds of both sexes look very much alike with brown on the back and cream and red
on the underside. The head is small, with a large set of feathers on the top, bright red eyes, and blue skin. Its
nearest relatives are the common birds, cuckoos. Its most striking feature, though, is only found in the young.
Baby hoatzins have a claw on the leading edge of each wing and another at the end of each wing tip. Using
these four claws, together with the beak (喙), they can climb about in the bushes, looking very much like
primitive birds must have done. When the young hoatzins have learned to fly, they lose their claws.
During the drier months between December and March hoatzins fly about the forest in groups of 20 to 30
birds, but in April, when the rainy season begins, they collect together in smaller living units of two to seven
birds for producing purposes.
B. The relatives and enemies of hoatzins.
C. Primitive birds and hoatzins of the Amazon.
D. The appearance and living habits of hoatzins.
B. they have claws on the wings
C. they eat a lot like a cow
D. they live on river banks
B. They could fly long distances.
C. They had four wings like hoatzins.
D. They had a head with long feathers on the top.
B. To protect themselves better.
C. To keep themselves warm.
D. To produce their young.
existence of creatures and even whole societies beyond our everyday lives.
This sense of wonder is universal. Look at the efforts that scientists have made to find out whether life of
some kind exists on Mars, and the popularity of fantasy (幻想) literature or movies like The Lord of the Rings.
This sense of wonder draws us to each other, to the world around us, and to the world of make-believe. But
have we gone so far in creating worlds of fantasy that we are missing the pleasure of other worlds that already
exist all around us?
Human beings, as biologists have suggested, possess an inborn desire to connect with and understand other
life forms. However, people, especially in big cities, often lead rather isolated lives. In a study of British
schoolchildren, it was found that children by age eight were much more familiar with characters from television
shows and video games than with common wildlife. Without modern technology, a small pond could be an
amazing world filled with strange and beautiful plants, insects, birds, and animals. When we lack meaningful
interaction (交互) with the world around us, and sometimes even with our families and friends, we seek to
understand and communicate with things that exist only in our imaginations or on a computer screen.
The world of make-believe is not necessarily bad. But when the world of fantasy becomes the only outlet
(出路) for our sense of wonder, then we are really missing something. We are missing a connection with the
living world. Other wonderful worlds exist all around us. But even more interesting is that if we look closely
enough, we can see that these worlds, in a broad sense, are really part of our own.
B. the wonderful achievements of fantasy literature
C. the fine taste of moviegoers around the world
D. the general existence of the sense of curiosity
B. The world around us could serve as a source of wonder.
C. The world of fantasy can be mirrored by a small and lively pond.
D. Modern technology prevents us from developing our sense of wonder.
B. be confused by the world of make-believe
C. miss the chance to recognize the fantasy world
D. be trapped by other worlds existing all around us
B. To warn us not to get lost in the fantasy world.
C. To argue against the misuse of the sense of wonder.
D. To discuss the influence of the world of make-believe.
Individuals (个人) should pay for their higher education.
A university education is of huge and direct benefit to the individual. Graduates earn more than non-
graduates. Meanwhile, social mobility is ever more dependent on having a degree. However, only some
people have it. So the individual, not the taxpayers, should pay for it. There are pressing calls on the
resources (资源) of the government. Using taxpayers" money to help a small number of people to earn
high incomes in the future is not one of them.
Full government funding (资助) is not very good for universities. Adam Smith worked in a Scottish
university whose teachers lived off student fees. He knew and looked down upon 18th-century Oxford,
where the academics lived comfortably off the income received from the government. Guaranteed salaries,
Smith argued, were the enemy of hard work; and when the academics were lazy and incompetent, the
students were similarly lazy.
If students have to pay for their education, they not only work harder, but also demand more from
their teachers. And their teachers have to keep them satisfied. If that means taking teaching seriously,
and giving less time to their own research interests, that is surely something to celebrate.
Many people believe that higher education should be free because it is good for the economy (经济).
Many graduates clearly do contribute to national wealth, but so do all the businesses that invest (投资)
and create jobs. If you believe that the government should pay for higher education because graduates
are economically productive, you should also believe that the government should pay part of business
costs. Anyone promising to create jobs should receive a gift of capital from the government to invest.
Therefore, it is the individual, not the government, who should pay for their university education.
B. pressing calls
C. college graduates
D. government resources
B. students are more demanding
C. students will become more competent
D. teachers will spend less time on teaching
B. call on them to finance students" studies
C. encourage graduates to go into business
D. show their contribution to higher education