单选题A______is one stock in a large company or corporation that is considered to be a secure investment.

单选题Nineteen Eighty-four is____.

单选题On a drab street lined with low-rise shops and restaurants, Dandelion Middle School is hardly noticeable.

单选题I haven' t the______idea what you mean.

单选题The meaning of a sentence is abstract and de-contextualized, while the meaning of an utterance is ______.

单选题Micro-sociolinguistics is sociolinguistics proper.（东南大学2003年研)

单选题It happened in a flash, although ______ everything seemed to occur in slow motion, as though I were watching from another planet.

单选题Ever since the early days of modem computing in the 1940s, the biological metaphor has been irresistible. The first computers—room-size behemoths—were referred to as "giant brains" or "electronic brains," in headlines and everyday speech. As computers improved and became capable of some tasks familiar to humans, like playing chess, the term used was "artificial intelligence". DNA, it is said, is the original software. For the most part, the biological metaphor has long been just that—a simplifying analogy rather than a blueprint for how to do computing. Engineering, not biology, guided the pursuit of artificial intelligence. As Frederick Jelinek, a pioneer in speech recognition, put it, "airplanes don"t flap their wings." Yet the principles of biology are gaining ground as a tool in computing. The shift in thinking results from advances in neuroscience and computer science, and from the push of necessity. The physical limits of conventional computer designs are within sight—not today or tomorrow, but soon enough. Nanoscale circuits cannot shrink much further. Today"s chips are power hogs, running hot, which curbs how much of a chip"s circuitry can be used. These limits loom as demand is accelerating for computing capacity to make sense of a surge of new digital data from sensors, online commerce, social networks, video streams and corporate and government databases. To meet the challenge, without gobbling the world"s energy supply, a different approach will be needed. And biology, scientists say, promises to contribute more than metaphors. "Every time we look at this, biology provides a clue as to how we should pursue the frontiers of computing," said John E. Kelly, the director of research at I. B. M. Dr. Kelly points to Watson, the question—answering computer that can play "Jeopardy!" and beat two human champions earlier this year. The I. B. M. "s clever machine consumes 85,000 watts of electricity, while the human brain runs on just 20 watts. "Evolution figured this out," Dr. Kelly said. Several biologically inspired paths are being explored by computer scientists in universities and corporate laboratories worldwide. One project, a collaboration of computer scientists and neuroscientists begun three years ago, has been encouraging enough that in August it won a $21 million round of government financing. In recent months, the team has developed prototype "neurosynaptic" microprocessors, or chips that operate more like neurons and synapses than like conventional semiconductors.

单选题As it is in the vicinity of the embassy area, the district where the complex is located is a major residential location for foreigners and foreign companies.

单选题He was______to tell the truth even to his close friend.

单选题The changes that A took place in air travel B during the last sixty years C would have seemed completely impossible to even the most brilliant scientists D at the turn of the 19 th century.

单选题In what ______ to a last minute stay of execution, a council announced that emergency funding would keep alive two aging satellites.

单选题The phrase " my small child"s cot" is an ambiguous phrase, which can be revealed by ______tree diagrams.

单选题America"s greatest playwright for the first half of the 20th century is ______.

单选题Promises and offers are characteristic of the group of______ of illocutionary acts.

单选题The crude craft which the Wright brothers made was the______of the modern airplane.

单选题Of the following works, which is not written by John Milton?

单选题She had to exercise all her______to prevent clashes between the two opinionated guests.

单选题They crawled for the next three hours along a main road where a line of traffic was so tightly together that it was______almost stationary.

单选题Language reflects sexism in society. Language itself is not sexist, just as it is not obscene; but it can connote sexist attitudes as well as attitudes about social taboos or racism.