[单项选择]There is no question that impure air is a health problem of great and increasing importance．
A. 不洁空气正在严重地而且越来越严重地威胁着人们的健康，这是毫无疑问的。
B. 毫无疑问，空气污染对人们的健康具有很大的危害，而且这种危害越来越严重。
C. 不洁空气对健康产生着越来越严重的威胁的问题是不存在的。
D. 空气污染极大地危害了人们的健康，这引起人们越来越多的重视。

[单项选择]There is no question that impure air is a health problem of great and increasing importance.
A. 不洁空气正在严重地而且越来越严重地威胁着人们的健康，这是毫无疑问的。
B. 毫无疑问，空气污染对人们的健康具有很大的危害，而且这种危害越来越严重。
C. 不洁空气对健康产生着越来越严重的威胁的问题是不存在的。
D. 空气污染极大地危害了人们的健康，这引起人们越来越多的重视。

[填空题]The question of health care reform again wafts about the corridors of power in Washington. The revolutionary spirit of Thomas Jefferson is invoked with the language of a Patients’ Bill of Rights. Life and liberty are again at stake, threatened by the tyrannical Chief Efficiency Officers of the managed care empires.
16. ______
Sadly, the answer is "no." Harry lost his management position three years ago in a downsizing applauded by Wall Street. He now works two jobs at $9 per hour and has no health benefits. Louise has metastatic breast cancer. They’ve re-mortgaged their house to pay her medical bills. They have no time for pointless political posturing.
In 1993 the Clinton administration undertook an honest effort at health reform. It was flawed in many ways. But it was inspired by a genuine moral vision that a just and caring society ought to assure all of its citizens the right to health care.
The defining moral features of the plan were:
· Universa

[单项选择]There is no question that the old style of air pollution could kill people. In one week following the infamous "peasouper" fog in December 1952, 4,700 people died in London. Most of these people were elderly and already had heart or lung diseases. A series of these killer fogs eventually led to the British Parliament passing the Clean Air Act which restricted the burning of coal.
Fortunately the effect of smog on the lungs is not so dramatic. Scientists have now conducted a number of laboratory experiments in which volunteers are exposed to ozone inside a steel chamber for a few hours. Even at quite low concentrations there is a reversible fall in lung function, an increase in the irritability of the lungs and evidence of airway inflammation (发炎). Although irritable and inflamed lungs are particularly seen in people with asthma (哮喘) and other lung diseases, these effects of ozone also occur in healthy subjects. Similar changes are also seen after exposure to nitrogen dioxide, alth
A. Low concentrations.
B. Fall in lung function.
C. Irritability of the lungs.
D. Airway inflammation.

[单项选择]Health depends （　） good food, fresh air and enough sleep.
A. from
B. up
C. on
D. over