单选题At no time ______ what was happening.

单选题After watching ______ TV, she played ______ violin for an hour.

单选题According to the passage, during the Civil War the South no longer provided the North with ______.

单选题What else does the United Negro College Fund bring to the good students?

单选题Without the friction between their feet and the ground, people would ______ be able to walk.

单选题What______ we are having these days!

单选题Thinking that you know ______ in fact you don't is not a good idea.

单选题下面的短文后列出了10个句子，请根据短文的内容对每个句子作出判断：如果该句提供的是正确信息，选择A；如果该句提供的是错误信息，选择B；如果该句的信息文中没有提及，选择C。在答题卡相应位置上将答案选项涂黑。Dollhouse History　　In America, when people hear the term “dollhouse,” they think of a small house

单选题 There is writes Daniele Fanelli in a recent issue of Nature, something rotten in the state of scientific research—an epidemic of false, biased, and falsified findings where 'only the most egregious cases of misconduct are discovered and punished.' Fanelli is a leading thinker in an increasingly alarming field of scientific research: one that seeks to find out why it is that so many scientific researches turn out to be wrong. For a long time the focus has either been on industry funding as a source of bias, particularly in drug research, or on those who deliberately commit fraud, such as the spectacular ease of Diederik Stapel, a Dutch social psychologist who was found to have fabricated at least 55 research papers over 20 years. But an increasing number of studies have shown that flawed research is a much wider phenomenon, especially in the biomedical sciences. Indeed, the investigation into Stapel also blamed a 'sloppy' research culture that often ignored inconvenient data and misunderstood important statistical methods. 'There's little question that the scientific literature is awash(充斥着) in false findings—findings that if you try to replicate you'll probably never succeed or at least find them to be different from what was initially said,' says Fanelli. 'But people don't appreciate that this is not because scientists are manipulating these results, consciously or unconsciously; it's largely because we have a system that favors statistical flukes (侥幸) instead of replicable findings.' This is why, he says, we need to extend the idea of academic misconduct (currently limited to fabrication, falsification, or plagiarism) to 'distorted reporting'—the failure to communicate all the information someone would need to validate your findings. Right now, he says, we're missing all the 'unconscious biases, the systemic biases, the practices, mistakes, and problems that hardly ever count as cheating', even though they have a very important—and probably the largest—effect on creating technically false results in the literature. One particularly challenging bias is that academic journals tend to publish only positive results. As Isabelle Boutron, a professor of epidemiology at René Descartes University in Paris, points out, studies have shown that peer reviewers are influenced by trial results; one study showed that they not only favored a paper showing a positive effect over a near-identical paper showing no effect, they also gave the positive paper higher scores for its scientific methods. And Boutron has herself found extensive evidence of scientists spinning their findings to claim benefits that their actual results didn't quite support. 'We need a major cultural change,' says Fanelli. 'But when you think that, even 20 years ago, these issues were practically never discussed, I think we're making considerable progress.'

单选题 Which of the following sentences is a SUGGESTION?

单选题Don't leave your bicycle out in the rain. It'll get ______.

单选题 Under an unstable economic environment, employers in the construction industry place great value on ______ in hiring and laying off workers as their volumes of work wax and wane.

单选题After a long walk, we finally found a shelter______for the night.

单选题What happened to the ship heading for New Orleans in 1784? 

单选题 Which of the following sentences is CORRECT?

单选题The problem is believed______at the meeting two days ago.

单选题 众所周知，吸烟不仅有害我们的健康，对环境也不利。吸烟能引起许多疾病，如肺癌(lung cancer)。吸烟也会影响不吸烟的人。被动吸烟者(passive smokers)生病的几率甚至高于吸烟者。有些年轻人认为吸烟很酷，有些人则认为吸烟能提神。如今，越来越多的公共场合挂起了禁止吸烟的标志。这是我们取得的巨大进步。为了我们的健康，我们需要做出更大的努力，禁止人们在公共场所吸烟。

单选题There are signs of promising market for our particular type of product and there is little doubt that a really active agent could ______ a big increase in our sales. A．bring out B．bring up C．bring about D．bring in

单选题Honey guides, or indicator birds,{{U}}collaborate{{/U}} with honey badgers in seeking out bee colonies.