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.
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
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2.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.
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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.
3.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.
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Slow waves functioned in the subjects’ brains in the experiment when
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4.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.
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The paragraph mainly talks about
The paragraph mainly talks about
A. observed intelligence occurs in the earliest years of life.
B. the importance of language and psychological aspects of the parent-child relationship.
C. the two major findings from the recent researches on intelligence.
D. lack of appropriate verbal stimulation leads to children’s disadvantage in intelligenc
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