调制解调器的作用是()A.把数字信号转换为模拟信号 B.把模拟信号和数字信号相互转换

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问题:

调制解调器的作用是()

A.把数字信号转换为模拟信号

B.把模拟信号和数字信号相互转换

C.把模拟信号转换为数字信号

D.其他三个答案都不对

考点:教师招聘考试中学教师招聘笔试云南省2007年特岗教师招考试卷(初中语文科目三)
题型:单项选择题

2010年7月,党中央、国务院召开了西部大开发工作会议,总结西部大开发10年取得的巨大成就和丰富经验,全面分析国内外形势和西部大开发面临的新机遇、新挑战。关于西部大开发战略,下列表述不正确的是( )。

A.西部大开发在我国区域协调发展总体战略中居于优先地位
B.西部大开发战略实施的最主要目的是解决沿海同内地的贫富差距
C.西部大开发覆盖地域指陕、甘、宁、青、新等西北五省(区)及西藏自治区
D.实施西部大开发的核心工作是保障和改善民生

题型:单项选择题

质数与质数相乘的积肯定是合数.______.(判断对错)

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下列变化属于化学变化的是()

A.石墨导电

B.活性炭吸附有毒气体

C.金刚石切割大理石

D.木炭还原氧化铜

题型:单项选择题

It is said that in England death is pressing, in Canada inevitable and in California optional. Small wonder. Americans’ life expectancy has nearly doubled over the past century. Failing hips can be replaced, clinical depression controlled, cataracts removed in a 30-minute surgical procedure. Such advances offer the aging population a quality of life that was unimaginable when I entered medicine 50 years ago. But not even a great health-care system can cure death—and our failure to confront that reality now threatens this greatness of ours.

Death is normal; we are genetically programmed to disintegrate and perish, even under ideal conditions. We all understand that at some level, yet as medical consumers we treat death as a problem to be solved. Shielded by third-party payers from the cost of our care we demand everything that can possibly be done for us, even if it’s useless. The most obvious example is latestage cancer care. Physicians—frustrated by their inability to cure the disease and fearing loss of hope in the patient—too often offer aggressive treatment far beyond what is scientifically justified.

In 1950, the U. S. spent $12.7 billion on health care. In 2002, the cost will be $1,540 billion. Anyone can see this trend is unsustainable. Yet few seem willing to try to reverse it. Some scholars conclude that a government with finite resources should simply stop paying for medical care that sustains life beyond a certain age—say 83 or so. Former Colorado governor Richard Lamm has been quoted as saying that the old and infirm "have a duty to die and get out of the way" so that younger, healthier people can realize their potential.

I would not go that far. Energetic people now routinely work through their 60s and beyond, and remain dazzlingly productive. At 78 Viacom chairman Sumner Redstone jokingly claims to be 53. Supreme Court Justice Sandra Day O’Connor is in her 70s, and former surgeon general C. Everett Koop chairs an Internet start-up in his 80s. These leaders are living proof that prevention works and that we can manage the health problems that come naturally with age. As a mere 68-year-old, I wish to age as productively as they have.

Yet there are limits to what a society can spend in this pursuit. As a physician, I know the most costly and dramatic measures may be ineffective and painful. I also know that people in Japan and Sweden, countries that spend far less on medical care, have achieved longer, healthier lives than we have. As a nation we may be overfunding the quest for unlikely cures while underfunding research on humbler therapies that could improve people’s lives.

The text intends to express the idea that ().

A. medicine will further prolong people’s lives

B. life beyond a certain limit is not worth living

C. death should be accepted as a fact of life

D. excessive demands increase the cost of health care

题型:单项选择题

心理学家把老年人的人格类型主要分为()、()、()()。

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