题目内容
（请给出正确答案）
Black Americans arc more likely to die of cancer than
A．people in other countries．
B．white Americans．
C．all other Americans．
D．their ancestors．
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更多“Black Americans arc more likel…”相关的问题
A、Small cell carcinoma
B、Squamous cell carcinoma
C、Leiomyoma
D、Adenocarcinoma
A．you can control its volume．
B．you needn’t take it off everyday．
C．it is solar-powered．
D．it saves power．
A Dolphin and an Astronomer
One day in 1963, a dolphin named Elvar and a famous astronomer, Carl Sagan, were playing a little game. The astronomer was visiting an institute which was looking into the way dolphins communicate with each other. Sagan was standing on the edge of one of the tanks where several of these friendly, highly intelligent creatures were kept. Elvar had just swum up alongside him and had turned on his back.
The dolphin wanted Sagan to scratch his stomach again, as the astronomer had done twice before. Elvar looked up at Sagan, waiting. Then, after a minute or so, the dolphin leapt up through the water and made a sound just like the word 'more'. The astonished astronomer went to the director of the institute and told him about the incident.'Oh, yes. That's one of the words he knows,' the director said, showing no surprise at all. Dolphins have bigger brains in proportion to their body size than humans have, and it has been known for a long time that they can make a number of sounds. What is more, these sounds seem to have different functions, such as warning each other of danger. Sound travels much faster and much further in water than it does in air. That is why the parts of the brain that deal with sound are much better developed in dolphins than in humans. But can it be said that dolphins have a 'language', in the real sense of the word？ Scientists don't agree on this.
A language is not just a collection of sounds, or even words. A language has a structure and what we call a grammar. The structure and grammar of a language'help to give it meaning. For example, the two questions 'Who loves Mary？' and 'Who does Mary love？' mean very different things. If you stop to think about it, you will see that this difference doesn't come from the words in the question but from the difference in structure. That is why the question 'Can dolphins speak？' can't be answered until we find out if dolphins not only make sounds but also arrange them in a grammatical order which affects their meaning.
第 16 题 The astronomer was not interested in the way dolphins communicate with each other.
A．Right
B．Wrong
C．Not mentioned
A．It was directed by signals converted from the electrical activity in Belle's brain.
B．It converted the electrical patterns into instructions for the other robot.
C．It was six hundred miles a way from where Belle was.
D．It could perform. the sa me-function as Belle did.
Credit Card Only Works When Spoken To
Acredit card that will not work unless it hears its owner's voice could become an important weapon in the fight against fraud (欺骗).
The card requires users to give a spoken password that it recognizes using a built-in voice-recognition chip. The idea is to prevent thieves using a stolen card or fraudsters using someone else's credit card details to buy goods online.
Amodel built by engineers at Beepcard in Santa Monica, California, represents the first attempt to pack a microphone, a loudspeaker, a battery and a voice-recognition chip into a standard-sized credit card.
They are not quite there yet: the card is the length and width of an ordinary credit card, but it is still about three times as thick. The company now plans to make it thinner.
The voice card is based on an earlier Beepcard technology designed to prevent fraud in online transactions. This earlier card has no microphone, but has a built-in loudspeaker that it uses to "squawk" (发出叫声) a voice ID signal via a computer's microphone to an online server.
By verifying (证实) that the signal matches the card details, the server can establish that the user is not simply keying in a credit card number but actually has the card to hand. The ID code changes each time the card is used in a pre-ordered sequence that only the server knows.
This prevents fraudsters recording the beeps, noting the card details and then playing back the audible ID when they key in the details later. But this earlier technology cannot prevent fraudulent use of stolen cards. The new one can.
The new voice card also identifies itself by its ID squawk, but it will not do this until it has verified the legitimate (合法的) user's spoken password. Thieves will be unable to use the card because even if they knew the password they would have to be able to copy the owner's voice with a high degree of accuracy.
The challenge for Beepcard has been to develop voice-recognition and audio circuitry that can be powered by a mini battery embedded (嵌入的) in a credit card. TO maximize battery life, the electronics are only switched on when the card is being used. Pressing a button on the card's surface prompts it to utter "Say your password" in female voice. If the voice-recognition software proves that the password is authentic (真实的), it sends its ID squawk which the server then identifies, allowing the transaction to proceed.
第 41 题 The voice credit card is an important invention because
A．it can be made cost-effectively.
B．it can leave voice messages.
C．it makes online shopping easy.
D．it makes fraud difficult.
A．presumably
B．in many cases
C．surely
D．without bias
Museums have changed. They are no longer places that one "should" visit, they are places to enjoy and learn.
At a science museum in Ontario, Canada, you can feel your hair stand on end as harmless electricity passes through your body. At the Metropolitan (成都市的) Museum of Art in New York City, you can look at the seventeenth century instruments while listening to their music. At New York's American Museum of Natural History recently, you can help make a bone-by-bone reproduction of the museum's dinosaur(恐龙), a beast that lived 200 million years age.
More and more museum directors are realizing that people learn best when they can somehow become part of what they are seeing. In many science museums, for example, there are no guided tours. The visitor is encouraged to touch, listen, operate, and experiment so as to discover scientific principles for himself. The purpose is not only to provide fun but also to help people feel at home in the world of science. The theory is that people who do not understand science will probably fear it, and those who fear science will not use it to best advantage.
One cause of all these changes is the increase in wealth and leisure time. Another cause is the rising percentage of young people in the population. Many of these young people are college students or college graduates, Leon F. Twiggs, a young black professor of art once said, "They see things in a new and different way. They are not satisfied to stand and look at works of art; they want art they can participate(参加) in. "The same is true of science and history.
When visiting museums nowadays, people can take part in many activities.
A．Right
B．Wrong
C．Not mentioned
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