单选题______ David's expression, we'd say he is not in a good mood today.

单选题This month’s amount of deposits in the bank _____ last month’s by fifteen percent.

单选题______ had we sat down than the telephone rang. A. Almost B. No sooner C. Hardly D. Just

单选题As a ______ president, his views are treated with respect when he is interviewed.

单选题For wildlife enthusiasts the journey is______because the region is known for its sea birds.

单选题John has never been on time, ______?

单选题W: I do hope Peter do well in his 'studies this semester.M:______

单选题If you are going to interview someone you ______ know something about them. A. should as well B. might as well C. had rather D. would rather

单选题Salesman:______Customer: Yes. What size is that green T-shirt?

单选题What do you think might be the reason he is finding it so difficult to get a job?

单选题阅读下面短文，请从短文后所给各题的4个选项（A、B、C、D）中选出1个最佳选项，并将所选答案的代码（指A、B、C或D）填在答题纸的相应位置上。It is estimated that there are more than 8 million restaurants in the world today.So it might surprise you to learn that restaura

单选题An analysis of the ideas in the novel compels an analysis of the form of the work, particularly when form and content are as ______ as they are in The House of the Seven Gables.

单选题Mr. Jones ______ the sale of his house which was near the beautiful beach in the lawyer's office. A. transposed B. transacted C. transfixed D. transcribed

单选题 Professor Stephen Hawking has warned that the creation of powerful artificial intelligence (AI) will be 'either the best, or the worst thing, ever to happen to humanity', and praised the creation of an academic institute dedicated to researching the future of intelligence as 'crucial to the future of our civilisation and our species'. Hawking was speaking at the opening of the Leverhulme Centre for the Future of Intelligence (LCFI) at Cambridge University, a multi-disciplinary institute that will attempt to tackle some of the open-ended questions raised by the rapid pace of development in AI research. 'We spend a great deal of time studying history,' Hawking said, 'which, let's face it, is mostly the history of stupidity. So it's a welcome change that people are studying instead the future of intelligence.' While the world-renowned physicist has often been cautious about AI, raising concerns that humanity could be the architect of its own destruction if it creates a super-intelligence with a will of its own, he was also quick to highlight the positives that AI research can bring. 'The potential benefits of creating intelligence are huge,' he said. 'We cannot predict what we might achieve when our own minds are amplified by AI. Perhaps with the tools of this new technological revolution, we will be able to undo some of the damage done to the natural world by the last one—industrialisation. And surely we will aim to finally eradicate disease and poverty. And every aspect of our lives will be transformed. In short, success in creating AI could be the biggest event in the history of our civilisation.' Huw Price, the centre's academic director and the Bertrand Russell professor of philosophy at Cambridge University, where Hawking is also an academic, said that the centre came about partially as a result of the university's Centre for Existential Risk. That institute examined a wider range of potential problems for humanity, while the LCFI has a narrow focus. AI pioneer Margaret Boden, professor of cognitive science at the University of Sussex, praised the progress of such discussions. As recently as 2009, she said, the topic wasn't taken seriously, even among AI researchers. 'AI is hugely exciting,' she said, 'but it has limitations, which present grave dangers given uncritical use.' The academic community is not alone in warning about the potential dangers of AI as well as the potential benefits. A number of pioneers from the technology industry, most famously the entrepreneur Elon Musk, have also expressed their concerns about the damage that a super-intelligent AI could do to humanity.

单选题On April 4th an alert went out around the University of Texas at Austin. Police had received a report of an Asian male, apparently carrying two weapons, near the university's main gym. Half an hour later an update came: the subject had been located. He was a member of the military training corps, and the guns were replicas. Phew. But that is the kind of situation that has gun opponents worried about a new bill working its way through the Texas legislature. The measure would allow people to carry concealed weapons on campus, as long as they have the proper license. That is currently prohibited in about half of the states, including Texas, although Texas lets individual universities opt out of the prohibition if they have their hearts set on it. Measures to overturn blanket campus prohibitions have popped up in a number of states this year, including Michigan, Arizona, Nevada, and Tennessee. This is, of course, contentious. Gun proponents argue that concealed weapons can make public places safer. They point to an incident from 2007, when a heavily armed gunman entered a Colorado church. He killed two people before one of the congregants, a former policewoman, managed to shoot him. Opponents respond that people with concealed weapons might accidentally make things worse in fraught (or just drunken) situations. At a hearing in Austin in March dozens of witnesses waited to testify, with high emotions on both sides. Students said that the idea frightened them. Those in favour spoke of the right to self-defence. But the issue at hand in these bills is not concealed guns exactly. Most states give people the right to have them, although there are certain places, such as airports and primary schools, where the right is limited. The logic is that these spaces have special security concerns. But are university campuses not special too? Critics of the legislation reckon that they are, given the youth of the population, and the emotional tensions of the environment. The critics have notched up some victories. On April 18th the governor of Arizona, Jan Brewer, vetoed that state's bill to allow "concealed carry" on campus. Earlier this month the Tennessee measure was shelved in committee. The Texas bill, after sailing through the House, seemed to stall in the state Senate. But on May 9th it made it through, after Republicans attached it to a bill intended to raise extra money for state universities. That bill passed and now goes back to the House. It is likely to pass, and then to be signed into law by the governor, Rick Perry. "I would argue that Texas is [already] a pretty gun-friendly state," said John Whitmire, a Democratic state senator from Houston, while chairing the March hearing. It looks like it.

单选题By law, when one makes a large purchase, he should have______opportunity to change his mind.

单选题Scientists have been struggling to find out the reason behind blushing （脸红）。Why would humans evolve（进化） a 21__________ that puts us at a social disadvantage by 22__________ us to reveal that we have c

单选题______ , he went to bed.

单选题Competition will enable customers to______ the quality of service they want.