Twitter, the micro-blogging service us...

单项选择题Twitter, the micro-blogging service used by tens of millions of people, went off-line last month. It blamed the trouble on a malicious programmer in Russia who was trying to shut down the account of a user in neighboring Georgi

a. It is astonishing the local actions of a small number of programmers can bring an entire Internet service to its knees, but that appears to have been the case.
Who was responsible for the collapse of TwitterA. All its users.B. A malicious programmer in Russia.C. A small number of programmers.D. A user in neighboring Georgia,

点击查看答案

你可能感兴趣的试题

1.单项选择题The absence of Y2K induced problems has been remarkable. There were no falling planes, no exploding power stations, no rogue missiles. Those horrors were always the stuff of myth. But so sparse were tales of disaster that journalists were driven to reporting on malfunctions in the breath-testing’ machines used on drunken motorists by the Hong Kong police. More problems may emerge in the coming weeks. Overall, though, Y2K has turned out to be Y20K:
One partial explanation is that the huge effort lavished(浪费) on bug-squashing has worked. The United States, according to a Commerce Department estimate, spent about 100 billion on the problem; the rest of the world probably spent about the same again. Those numbers are far smaller than some of the more exotic figures trailed a few years ago, but they are still substantial. Yet even the countries that had begun work late and done little-southern Europe, Russia, much of Asia-had a trouble free new year. So was the money wasted
According to the author, the amount of money spent on the Y2K problem was

A. too much.
B. not enough.
C. significant.
D. the same as had been expecte

点击查看答案

2.单项选择题"Copy the ways of nature", we were told. Yes, copy Nature—for everything comes directly or indirectly from natural things. Often we have to put our knowledge to work, treating Nature’s materials so as to make them serve our purposes better. We could, certainly, take the skin from a dead animal and at once make a pair of shoes with it; but they wouldn’t be very good shoes. For our purpose it is better first to treat the skin with chemicals that turn it into leather.
Why is it necessary for us to treat Nature’s material

A. An animal’s skin is not really useful to us.
B. Our purposes can be better served.
C. Natural materials are limited.
D. It is difficult to copy natur

点击查看答案

3.单项选择题The other, more publicly acceptable form of geo-engineering would focus on removing carbon from the atmosphere and storing it underground. Known as carbon capture and storage (CCS), this idea is behind today’s experimental clean-power plants, which are attracting lots of research and funding. But clean, coal plants will only reduce future emissions, which does not address the root of the problem. Among all the uncertainties that still surround climate change, one thing has become clear: the scary durability of carbon, which will hang in the air for a thousand years, continuing to warm the planet no matter how drastically future emissions are cut. So there is a growing urgency behind the geo-engineer’s dream: to change the climate by artificial means, either sucking the existing carbon out of the air or cooling the air with solar reflectors.
Why is carbon so scary according to the passage

A. It will contihue to warm the globe for many years.
B. It cannot be easily captured and stored.
C. Its emission will increase in the coming years.
D. It cannot be reflected back into the spac

点击查看答案

4.单项选择题Until recently, the industry has had little guidance in how to proceed with development without harming wildlife. Regulations are mostly imposed by states or local authorities, whose patchwork guidelines vary from stringent to lax. The Wind Turbine Guidelines Advisory Committee, established in 2007 under the U. S. Fish and Wildlife Service, is proposing federal recommendations to reduce wind development’s effect on wildlife. Composed of wind-industry members, wildlife officials, and federal authorities, the committee will present the recommendations to the secretary of the interior for review in October. The recommendations are voluntary, but according to David Stout of the U. S. Fish and Wildlife Service, the guidelines will be" unprecedented in terms of companies agreeing to hold themselves to a higher standard."
The Wind Turbine Guidelines Advisory Committee is composed of all the following EXCEPT

A. wind-industry members.
B. wildlife officials.
C. federal authorities.
D. David Stout.

点击查看答案

5.单项选择题Cigarettes and mental illness have always tend to go together. An estimated 1.25 billionpeople smoke worldwide. Yet people who are depressed or anxious are twice as likely to smoke, and up to 88 per cent of those with psychotic disorders such as schizophrenia are smokers. A recent American survey concluded that around half of all cigarettes bum in the fingers of those with mental illness.
Recent American survey showed that.

A. there are 1.25 billion smokers worldwide.
B. 88% of people with psychotic disorders are smokers.
C. about 625 million smokers have mental problems.
D. 2.5 billion people have mental problems worldwid

点击查看答案

6.单项选择题The mathematical model recommended by Britain’s National Radiological Protection Board (NRPB) predicted that the screening programme would cause 36 cancers per 100,000 women, 18 of them fatal. The model preferred by the UN Scientific Committee on the Effects of Atomic Radiation led to a lower figure of 20 cancers.
The researchers argue that the level of radiation-induced cancers is "not very significant" compared to the far larger number of cancers that are discovered and treated. The Valencia programme, they say, detects between 300 and 450 cases of breast cancer in every 100,000 women screened.
The model recommended by the UN Scientific Committee on the Effects of Atomic Radiation would probably cause ______ cancers in 100,000 women screened.

A. 300
B. 450
C. 36
D. 20

点击查看答案

7.单项选择题A municipal management plan for storm-water runoff is mandated by the Clean Water Act. Early this year, Urban Stormwater Management in the United States, a report commissioned by the Environmental Protection Agency (EPA), recommended a number of ways to manage runoff, including using structural devices, like the kind AbTech produces. Rink is hoping that his merchandise appeals to budget-strapped municipalities. "Compared with building new storm-water treatment plants or upgrading already existing facilities to handle runoff pollution, which would cost in the millions of dollars, our products are very affordable," he says. The federal stimulus bill could make them even more so.
AbTech products are

A. structural devices.
B. the best solution to run off.
C. appealing to budget-strapped municipalities.
D. costly.

点击查看答案

8.单项选择题Lunge cancer, hypertension, heart disease, birth defects—we are all too familiar with the danger of smoking. But add to that list a frightening new concern. Mental illness. According to some controversial new findings, if smoking does not kill you, it may, quite literally, drive you to despair.
The tobacco industry openly pushes its product as something to lift your mood and soothe anxiety. But the short-term feel-good effect may mask the truth :that smoking may women or even trigger anxiety disorders, panic attacks and depression ,perhaps even schizophrenia (精神分裂症)
What is the main idea of the two paragraphs

A. Smoking causes great dangers to the body.
B. Smoking is a good way to soothe anxiety.
C. Smoking probably leads to mental illness.
D. Smoking does not kill smokers.

点击查看答案

9.单项选择题How sleep helps us consolidate memories is still largely a mystery. A recent study from the University of Lǔbeck, in Germany, offers one clue. Subjects were given a list of 46 word pairs to memorize, just before sleep. Then when they reached the deepest stages of sleep, electrical currents were sent through electrodes on their heads to induce very slow brain waves. Such slow waves were induced at random in the brains of one group of subjects, but not another.
The next morning, the slow-wave group had better recall of the words. Other types of memory were not improved, and inducing the slow waves later in the night did not have the same effect. Why and how the slow waves improved memory is not yet understood, but they are thought to alter the strengths of chemical connections, or synapses, between specific pairs of nerve cells in the brain. Memories are "stored" in these synapses: changing the strength of the synapses increases the strength of the memories they store.
Slow waves functioned in the subjects’ brains in the experiment when

A. they were given a list of words before sleep.
B. they reached the deepest stages of sleep.
C. they were connected to electrical currents.
D. they were asked to recall the words the next mornin

点击查看答案

10.单项选择题This is not only an American problem, but a global one. The energy demand is driven by population growth especially in developing countries, in places that have emerging middle classes. Their focus is now on growth and on providing lifestyle and energy to their population. It’s not environment. But they’ll have to focus on it and do something about it.
Developing countries focus on all the following EXCEPT

A. economic growth.
B. providing lifestyles to people.
C. providing energy to people.
D. protecting the environment.

点击查看答案

延伸阅读

你可能感兴趣的试题