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Jacobson is often referred to ______ at the factory.
A．as the best engineer
B．be the best engineer
C．by the president to be best engineer
D．as being the best engineer
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Why an electronic book？ Computers can store a ton of data and their laptop companions make all that information portable. True enough. But laptops(便携式电脑) and similar portable information de vices require a lot of power and heavy batteries to keep their LCD screens operating. And LCDs are not easy to read in the bright light of the sun.
Fact is, when it comes to portability, easy viewing, and low power requirements, it's hard to beat plain old paper.
So let's make the ink electronic.
That's the deceptively simple premise behind a project currently coming to fruition at the Massachusetts Institute of Technology. Some hurdles mostly having to do with large-scale manufacturing remain, so it will be a few years before you see an electronic book for sale in stores. But the basic technology already exists, developed at the Institute's Media Lab by a team led by physicist Joe Jacobson.
Thanks to electronic ink, the book essentially typesets itself, receiving instructions for each page via electronics housed in the spine. From a power standpoint, this process makes the electronic book very efficient. Unlike an LCD screen, which uses power all the time, energy is no longer needed to view the electronic book's pages once they are typeset. Only a small battery would be required, as opposed to the large ones needed to power laptop computers and their LCDs.
Convenience, though, is still the main attraction—and that means more than simple portability. Be cause the information is in electronic form, it can be easily manipulated.
Jacobson thinks an electronic book will be affordable around $ 200 for a basic read-only model to about $ 400 for one that would record your margin scribbles. Some hurdles remain, though, before you can take an electronic book with you anywhere. Paper is produced in long sheets, and Jacobson is still working on the best method to integrate electronic ink into that process. To avoid having to use thousands of tiny wires on each page, the ink itself must be conductive. Such ink was recently demonstrated in the lab but has yet to be produced in volume. "Essentially," notes Jacobson, "We're trying to print chips."
Jacobson is confident, however, that this can be done on a large scale. If Jacobson succeeds, he will have made the book for the 21st century.
According to the passage, which book is the only book you'll ever need？
A．Americans like sports and sports reveal much about the changing ethnic structure of the United States
B．A single volume.
C．New Age tome.
D．An electronic book.
Which is NOT true of people with social anxiety disorder？
A．They're often isolated and ashamed.
B．They find it difficult to make friends.
C．They often fail to get timely treatment.
D．They tend to judge or criticize other people.
A.angry
B.happy
C.surprise
D.irritated
A.What; hard
B.What; delicious
C.How; ba
D.How; delicious
A.one
B.two
C.three
D.four
Dr. Martin Jacobson of Silver Spring, Md., assigned patent rights to the U. S. Government as represented by the Secretary of Agriculture. The chemical can be used to detect gypsy moth infestations, as well as to control the insects.
The gypsy moth does serious damage to forest and shade trees in New England and eastern New York State. The caterpillars, or larvae, of gypsy moths eat the leaves of trees, often causing death by a single attack. Losses of hardwood trees have been estimated at tens of millions of dollars from a 20-year study.
Gypsy moths were prevented from spreading to other U. S. forest areas by using the natural attractant of the female to detect infestations, then spraying with chemicals such as DDT to kill the insects.
Since the lure could previously be obtained only by clipping the last two abdominal segments of the virgin female moth, extracting the segments with benzene and then processing to stabilize the chemical, the procedure was expensive. Another difficulty was that, as the gypsy moth population declined, it became increasingly hard to obtain the females needed for lure production.
Dr. Jacobson overcame both these difficulties by discovering a synthetic method for making the female's attractant chemical. The chemical is known as 12-acetoxy-l-hydroxycis-9- octadecene. It is so potent that the fraction of a drop produced by the female is 200,000 times more than the amount needed to catch a mate. The synthetic chemical is also very powerful--it works in amounts about equivalent to one drop in a box car.
The flightless female gypsy moth mates only once a year and, as soon as she does, an enzyme switches off production of the sex attractant. The winged male, however, call mate several times and it is because of this that the chemical is being used for pest control.
By using a mixture of attractant and DDT in traps lined with a sticky substance, enough males can be caught to reduce the gypsy moth population substantially.
The damage done by gypsy moths to trees in New England and New York is done by ______.
A．only the male moth
B．only the female moth
C．a substitute female attractant
D．caterpillars
A．on impulse
B．by intuition
C．by speculation
D．by interrogation
A．are reading
B．were reading
C．have been reading
D．had reading
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