离心式风机叶轮前盘型式最简单的是（） A.平直前盘 B.维型前盘 C.弧形前盘 D.

从防止空气污染考滤，下列实验应在通风橱中进行的是[ ]

A.

B.

C.

D.

社会交换论认为态度改变的关键是（）。

A.诱因的强度

B.回避动机

C.达到平衡状态

D.趋向动机

下列做法符合我国分配制度的有

①把按劳分配和按生产要素分配结合起来

②允许和鼓励资本、技术等生产要素参与收益分配

③凭借行业垄断和某些特殊条件获得个人额外收入

④规范收入分配、消除收入差距、防止两极分化

A．①②④　

B．①④

C．②③④

D．①②

Looking for a new weight loss plan? Try living on top of a mountain. Mountain air contains less oxygen than air at lower altitudes, so breathing it causes the heart to beat faster and the body to burn more energy. A handful of studies have found that athletes training at high altitudes tend to lose weight. Doctor Florian Lippl of the University Hospital Of Ludwig-Maximilians-university Munich wondered how the mountain air would affect overweight individuals if they weren’t doing any more physical activity than usual.

Lippl and his colleagues invited 20 overweight men to an environmental research station about 300 meters below the summit of Zugspitze, a mountain around 2,970 meters near the Austrian border. They were allowed to eat as much as they liked. The men also gave blood so that researchers could test for hormones linked to appetite and fatness. At the end of the week, the men, whose mean weight starting out was 105kg, had lost on average about l.5kg. The men’s blood pressure also dropped, which the researchers believed was due to weight lost.

Exactly what caused the weight loss is uncertain. Loss of appetite is common at higher altitudes, and indeed the men ate significantly less than usual—about 700 calories fewer per day. Lippl also notes that because their consumption was being recorded, they may have been more self-conscious about what they ate. Regardless, eating less accounts for just l kg of the l.5 kg lost, says Lippl. He thinks the increased metabolic (新陈代谢的) rate, which was measured, also contributed to weight loss but cannot separate the different effects with the given data.

Appetite loss at high altitudes could certainly be key, notes Damian Bailey, a physiologist at the University of Glamorgan, UK, who recently lost 11 kg during a 3-month expedition to the Andes in Chile.   

Unfortunately, for the average person there is no treatment that can resemble living at high altitude, says Lippl. The only alternative is hypobaric chamber, which exposes subjects to low oxygen and isn’t practical as a treatment. He says, half- jokingly, “If fat people plan their holidays, they might not go to the sea, but maybe to the mountain.”

小题1:What contributes the most to one’s heart rates according to the first paragraph?

A．our bodyweight

B．the consumption of energy

C．the rates of our breathing

D．the amount of oxygen provided小题2:Hormones are tested in the research because they can affect ______.

A．one’s bodyweight

B．one’s blood pressure

C．one’s way of living

D．one’s metabolic rate小题3:What was found about the 20 overweight men in the process of the research?

A．They controlled what to eat self-consciously.

B．They took in much fewer calories than usual.

C．They lost appetite because of lack of physical activity.

D．They were provided with a healthier diet than before.小题4:Why does Damian Bailey agree with the idea of appetite loss at high altitudes?

A．He experimented with the new weight loss plan in the Andes.

B．He found no other reasons for his loss of weight in the Andes.

C．He researched the related subject in the Andes.

D．He lost much weight in the high altitude Andes.小题5:In what manner does Lippl talk about the way of losing weight by spending holidays on mountains?

A．casual

B．inaccurate

C．uncertain

D．confident

对鉴别上下消化道出血可能有帮助的是（）

A.大便潜血阳性

B.血尿素氮升高

C.血肌酐升高

D.血红蛋白下降

E.血氨升高