Yuthachai fuel is welcomed by both farmers and ferry operators for its low prices．

A . quantity of fuel to be received B . flash point of the fuel as it is received C . fuel temperature as it is received D . viscosity of the fuel being received

A . in time of B . in case of C . in terms of D . in honour of

A . the viscosity index B . the fuel oil contents C . the starting speed D . the reading at the rack

A . broken down B . stuck C . oil leakage D . carbonized

A . Bad combustion of the fuel B . Bad atomization of the fuel C . Liquid contaminants D . Solid contaminant

A . Right B . Wrong C . Not mentioned

A . All engines，motors，fans，etc. should be shut down when fueling B . All windows，doors，hatches，etc. should be closed C . A fire extinguisher should be kept nearby D . Fuel tanks should be topped off with no room for expansio

A . lower than normal cylinder pressure and low exhaust temperature B . lower than normal cylinder pressure and high exhaust temperature C . higher than normal cylinder pressure and low exhaust temperature D . higher than normal cylinder pressure and high exhaust temperature

A . a spark plug B . injectors C . the heat of compression D . increasing jacket water temperature

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A . absolute value B . relative value C . constant value D . set value

A . water leakage B . steam leakage C . oil leakage D . air leakage

A . would present B . present C . presents D . ought to present

A . Class A B . Class B C . Class C D . Class D

A . kerosene B . unleaded gasoline C . diesel oil D . liquefied ga

A . kerosene B . unleaded gasoline C . diesel oil D . liquefied ga

A、很容易蒸发 B、 很容易爆炸

M: Thank you. As you can see, little by little, Americans are turning to solar power, tapping the strength of the sun for energy. W: Yeah, that's true. Sunlight has already been used for heating or cooling homes and office buildings in the sunny south. M: Experts say all signs point to the birth of the solar energy industry. Right now, an increasing number of companies are selling solar collector panels to heat and cool homes or to heat water. The glass and metal panels each cost from ＄100 to more than ＄500, and the three or four-bedroom home usually requires a dozen or more. They look like sandwiches. They are usually placed in rooftops. Nobody knows how many have been sold, and in addition, many people have built their own units. It has been estimated that solar power equipment will be a $1.3 billion industry by 1995, and more than a million homes will use sunlight for heat, air conditioning or to generate electricity, both in the cities and in countryside. W: Wow! That is really big business. What do we learn about the use of solar energy in the U. S. ？ A．It is very well established. B．It is relatively new. C．It is found in one million homes. D．It is being rapidly expanded.

The valley's business ecology depends on failure the same way the tree-covered hills around us depend on fire it wipes out the old growth and creates space for new life. The valley has always been in danger of drowning in the unwelcome waste products of success too many people, too expensive houses, too much traffic, too little office space and too much money chasing too few startups. Failure is the safety valve, the destructive renewing force that frees up people, ideas and capital and recombines them, creating new revolutions. Consider how the Internet revolution came to be. After half a decade of start-up struggles, for example, hundreds of millions of Hollywood dollars were going up in smoke. It all seemed like a terrible waste, but no one noticed that the collapse left one very important byproduct, a community of laid-off C++ programmers who were now expert in multimedia design, and out on the street looking for the next big thing. These media geeks were the pioneer of the dot-com revolution. They were the Web's business pioneers, applying their newfound media sensibilities to create one little company after another. Most of these start-ups failed, but even in failure they advanced the new medium of cyberspace. A few geeks, like Silicon Graphics founder Jim Clark, succeeded and utterly changed our lives. In 1994 Clark was unemployed after leaving the company be founded, doggedly trying to develop a new interactive-TV concept. He approached Marc Andreessen, the co developer of Mosaic, the first widely used Internet browser, in hope of persuading Andreessen to help him design his new system. Instead, Andreessen opened Clark's eyes to the Web's potential. Clark promptly tossed his TV plans in the trash, and the two co-founded Netscape, the cornerstone of the consumer-Web revolution. Like the interactive-TV refugees and generations of innovators before them, the dot-comers are already hatching new companies. Many are revisiting good ideas executed badly in the 1990s, while others are striking out into entirely new spaces. This happy chaos is certain to mature into a new order likely to upset an establishment, as it delivers life-changing wonders to the rest of us. But this is just the start, for revolutions give birth to revolutions. So let's hope for more of Silicon Valley's successful failures. What is implied in the first sentence？ A．The Silicon Valley blamed its failure on the success of Wall Street. B．The Silicon Valley is also noted for its complex ecological web. C．The Silicon Valley takes a vain pride in its overabundant successes. D．The Silicon Valley would benefit from the collapse in certain ways.

W: Thank you. M: Well, we hear it a lot in the news these days: "Recycle newspapers and save a tree. Collect bottles and cans so they can be reused in the manufacturing of new products." But how to promote the recycling movement？ Can you give us some suggestions？ W: I think there are three essential keys. M: What is the first one？ W: The first key is to have a more informed public, that is, to raise public awareness about the recycling process, to explain the kinds of materials that can be recycled, and provide ways on how to properly dispose of them. Local governments should educate the public on how to properly sort reusable materials from those, like waxed paper, carbon paper, plastic material such as fast food wrappers, that can't be recycled very easily. M: Then what is the second key？ W: The second is the development of improved technology. Technological progress has been made on many fronts, but governmental agencies need to step up their support for companies involved in recycling by providing tax incentives, low-cost loans, or even grants to upgrade equipment and to encourage further research. M: So what about the third essential key？ W: The final key is to develop a greater demand for recycled materials. This means increasing demand for the growing surplus of resources waiting to be recycled. M: Recycling is a crucial link protecting our planet. The three keys Mrs. Green mentioned are important ways to achieve this end. Thanks for joining us, Mrs. Green. W: You're welcome. (23) A．Keys to paper recycling. B．Importance of recycling. C．Keys to recycling improvement. D．Technological progress in recycling.