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听力原文：W: David, who are the street people？ How did they get to living in the street？
M: Well, some of them lost their job, some of them have mental problem, and some of them drink.
Q: which of the following factors is not mentioned as a cause of becoming street people？
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听力原文：W: I'm very impressed by all the work you've done in your houses, Mr. Peterson. How long have you been working on it？
M: I first became interested in doing things myself several years ago. I've been doing something on it every now and then for almost a year now. You know, I couldn't afford to pay workman to do it.
Q: What do we learn about Mr. Peterson？
(15)
A．Programs can be transmitted live internationally.B．Astronauts have regularly sent te
The events of Sept. 11 have ratcheted up security at American airports to the highest level ever, according to a spokesman for Transportation Secretary Norman Mineta. But to say there is plenty of room for improvement puts it mildly:
Hundreds of employees with access to high-security areas at 15 U.S. airports have been arrested or indicted by federal law enforcement officials for using phony Social Security numbers, lying about criminal convictions or being in the United States illegally. None of those arrested had terrorist links, but some aviation experts said the workers were in a position to help smuggle weapons or bombs aboard aircraft if they had wanted.
Tests ordered by President Bush and conducted by federal agents at 32 airports between November and February, when airports were on highest alert, showed that Security screeners failed to detect knives 70% of the time, guns 30% of the time and simulated explosives 60% of the time.
Two members of the House Transportation Committee are pushing to reverse the administration's opposition to arming pilots because groups representing pilots are insisting that their members need to be armed as a last line of defense.
Attorney General John Ashcroft said the arrests of hundreds of airport employees showed that the system of background checks—done piecemeal by airlines, private contractors and others—needs tightening. That much is painfully obvious. What isn't clear is why the system was so porous (有漏洞的) to begin with and why it wasn't immediately tightened after that infamous Tuesday in September.
Some people in the industry wisely have suggested that all airport workers be required to pass through the same metal detectors and other Security checks as flight crews do. Congress has ordered the new Transpiration Security Administration to find ways to enact just such a requirement. Unfortunately, no deadline has been set, in part because federal officials are preoccupied with getting thousands of new baggage screeners in place by Nov. 19---when the feds take over airport security—and installing bomb—detection equipment in all airports by the end of the year.
Plainly, those two goals are critical. But it would be a mistake to give low priority to fixing other gaping holes in the nation's airport security net. If the federal crackdown is going to be effective, it needs to be comprehensive.
The possible mason for hundreds of airport employees being arrested might be one of the following except ______.
When an invention is made, the inventor has three possible 【C1】______ of action open to him: he can give the invention to file world by publishing it, keep the idea 【C2】______ , or patent it.
A 【C3】______ patent is the result of a bargain 【C4】______ between an inventor and the state, but the inventor gets a limited period of monopoly and publishes full details of his invention to the public after that period 【C5】______ .
Only in the most exceptional circumstances 【C6】______ the lifespan of a patent 【C7】______ to alter this normal process of events
The longest extension ever 【C8】______ was to Georges Valensi; his 1939 patent for color TV receiver circuit was extended until 1971 because for most of the patent's normal life there was no color TV to 【C9】______ and thus no hope for reward for the invention.
Because a patent remains permanently 【C10】______ after it has terminated, the shelves of the library attached to the 【C11】______ office contain details of literally millions of ideas that are free for anyone to use and, if 【C12】______ than half a century, sometimes even re-patent. Indeed, patent experts often advise anyone 【C13】______ to avoid the high cost of conducting a search through【C14】______ patents that the one sure way of violation of any other inventor's right is to plagiarize a dead patent. Likewise, because publication of an idea in any other form【C15】______ invalidates further patents on that idea, it is traditionally 【C16】______ to take ideas from other areas of print. Much modem technological advance is【C17】______ on these presumptions of legal security.
Anyone closely 【C18】______ in patents and inventions soon learns that most "new" ideas are, in fact, as old as the hills. It is theft reduction to commercial practice, either through necessity or dedication, or through the availability of new technology,【C19】______ makes news and money. The basic patent for the theory for magnetic recording dates back to 1886. Many of the original ideas behind television originate 【C20】______ the late 19th and early 20th century. Even the Volkswagen rear engine car was anticipated by a 1904 patent for a cart with the horse at the rear.
【C1】______
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