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Directions: In this part, there are 30 incomplete sentences. For each sentence there are four choices marked A, B, C and D. Choose the ONE answer that best completes the sentence. Then mark the corresponding letter on the Answer Sheet with a single line through the centre.
16. It is necessary that an efficient worker ______ his work on time.

A.
16.
B.

【参考答案】

C
16．[]C。在句型“Itisnecessarythat……”中that从句中要用虚拟语气，其构成是shoulddo。

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Sleep Problems Plague the Older SetOlder Americans often have difficulty getting a good night's rest. It's a huge quality-of-life problem, experts say, because contrary to popular belief, seniors require about the same amount of sleep as younger adults.'Sleep problems and sleep disorders are not an inherent (固有的) part of aging,' said Dr. Harrison G. Bloom, an associate clinical professor of geriatrics (老年病学) and medicine at the Mount Sinai School of Medicine in New York City. 'It's pretty much of a myth that older people need less sleep than younger people.'Yet, in a study published recently in The American Journal of Medicine, researchers found that more than half of older Americans have problems getting the sleep they need.Older people tend to have 'sleep fragmentation,' meaning they wake up more often during the night, said study author Dr. Julie Gammack, an assistant professor of medicine in the Division of Geriatric Medicine at St. Louis University.They also seem to get less 'REM' sleep, the type of sleep during which rapid eye movement occurs, Bloom added.It's unclear what role these naturally occurring changes in sleep patterns have on a person's quality of life, Bloom said 'What is important, though, is that older people often have actual sleep disorders and problems with sleep,' he said.And, experts say, there is usually more than one cause.'Sleep trouble in older adults is typically associated with acute and chronic illnesses, including specific sleep disorders like sleep apnea (呼吸暂停) and restless leg syndrome that appear with greater frequency in older populations,' said Michael V. Vitiello, a professor of psychiatry and behavioral sciences and associate director of the University of Washington's Northwest Geriatric Education Center.Taking multiple medications, as many older people do, can also lead to fatigue and 'hypersomnia,' or being tired all the time, Bloom added.Another big problem, he noted, is depression and anxiety. 'Those are very commonly associated with sleep problems.'Despite the prevalence (流行) of sleep difficulties in older adults, many patients aren't getting the help they need As a result, problems like insomnia (失眠), restless leg syndrome and sleep apnea are underdiagnosed and undertreated, Bloom said.Sleep problems can seriously affect one's quality of life.mentioned

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Many Children's Deaths Preventable: WHOOver five million children die each year from disease, infections and accidents related.【H1】their environment although many of these deaths are largely preventable, says the World Health Organization.On Monday, the WHO asked governments and citizens around the world to take action to create healthy 【H2】for children as it celebrated World Health Day.'The biggest threats to children's health lurk (潜藏) in the very 【H3】that should be safest - home, school and community, said Dr. Gro Harlem Brundtland, director-general of the WHO at the day's launch in New Delhi, India.'Every child has the right to 【H4】 up in a healthy home, school and community. The future development of our children — and of their world — depends on 【H5】 enjoying good health now. We have their future in our 【H6】 . Now we must work more effectively together to 【H7】 the risks from the environment which our children face,' Brundtland said.This year's theme, 'Healthy Environments for Children' focuses on the many dangers 【H8】 by children in and around the places where they live and play.These include inadequate access to safe【H9】 water and sanitation (卫生设备), insect-borne diseases, air pollution, chemical hazards and injuries from traffic, falls, burns and drownings.Communities around the world organized events to promote awareness of children's health issues, 【H10】 included drawing contests for schoolchildren in Vietnam, street plays in India, puppet (木偶) shows in Namibia and professional lectures for policy makers in Germany and elsewhere.Activities also took 【H11】 in cities across Canada on Monday, including Calgary, Montreal, Halifax and Ottawa.Although children under five represent only 10 per cent of the world's population, they bear 40 per cent of the global disease【H12】 , says the WHO. And as much as one-third of the total burden of disease may be caused by environmental 【H13】 .World Health Day has been celebrated on April 7th 【H14】 1950. Each year the WHO chooses a theme to highlight areas of particular concern. Last year's 【H15】 , Move for Health, focuses on promoting physical activity as part of healthy living.【H1】

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