题目内容

Questions 26 to 30 are based on the following passage. Exercise is one of the few factors with a positive role in long-term maintenance of body weight. Unfortunately, that message has not gotten through to the average American, who would rather try switching to “light” beer and low-calorie bread than increase physical exertion. The Centers for Disease Control, for example, found that fewer than one-fourth of overweight adults who were trying to shed pounds said they were combining exercise with their diet. In rejecting exercise, some people may be discouraged too much by caloric-expenditure charts: for example, one would have to briskly walk three miles just to work off the 275 calories in one delicious Danish pastry (小甜饼). Even exercise professionals concede half a point here. “Exercise by itself is a very tough way to lose weight,” says York Onnen, program director of the President’s Council on Physical Fitness and Sports. Still, exercise’s supporting role in weight reduction is vital. A study at the Boston University Medical Center of overweight police officers and other public employees confirmed that those who dieted without exercise regained almost all their old weight, while those who worked exercise into their daily routine maintained their new weight. If you have been sedentary (极少活动的) and decide to start walking one mile a day, the added exercise could burn an extra 100 calories daily. In a year’s time, assuming no increase in food intake, you could lose ten pounds. By increasing the distance of your walks gradually and making other dietary adjustments, you may lose even more weight. “Even exercise professionals concede half a point here” (Line 3, Para. 2) means “They ()”.

A. agree that the calories in a small piece of pastry can be difficult to work off by exercise
B. partially believe diet plays a supporting role in weight reduction
C. are not fully convinced that dieting can help maintain one’s new weight
D. are not sufficiently informed of the positive role of exercise in losing weight

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库房建筑有哪些要求?

THDS-A探测系统中探头静态输出噪声有效值小于()

A. 20mV
B. 30mV
C. 40mV
D. 50mV

由于船舶的特殊性,在设计过程中要求动力装置不但要选择可靠性好的设备和零部件,还要分析()对可靠性的影响。

A. 备件管理和使用环境
B. 不同的连接方法和不同储备
C. 维修制度
D. 质量检验方法

工程上所说的交流电压、交流电流的数值,通常也都是它们的有效值,此值与交流电最大值的数量关系为:最大值是有效值的()倍。

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