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.
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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.
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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
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