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问题 多项选择题

夜间阵发性呼吸困难的发作与下列哪些发病机制有关（）。

A.静脉回心血量增加

B.平卧时膈肌上升，肺活量减少

C.夜间迷走神经兴奋性增高

D.熟睡时对缺氧更敏感

E.夜间机体耗氧量增加

答案

参考答案：A, B, C

单项选择题 A1型题

妊娠合并尖锐湿疣对胎儿及新生儿的影响叙述不恰当是（）

A.所生新生儿可患喉 * * 瘤

B.可传染给新生儿

C.绝大多数是通过软产道感染

D.胎儿宫内感染极罕见

E.尖锐湿疣是剖宫产的手术指征
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单项选择题

Who says your job leaves you no time to hit the gym A detailed new study of U. S. physical activity patterns shows that men who work full-time—whether their jobs are active or sedentary— end up getting more exercise than healthy working-age men without a job.
The new study comes from researchers at the National Institutes of Health (NIH). As part of the National Health and Nutrition Examination Survey in 2003, some 1,800 working-age adults were asked questions about their lifestyle and work habits, and, most importantly, they then agreed to wear an accelerometer—a device to measure their physical activity—over the course of several days.
Those data from the accelerometers provide a rare opportunity to nail down how much activity the typical American actually does.
They show that men or women who work in active jobs do more physical activity on weekdays than men or women working in sedentary jobs: that’s perhaps not surprising, but the NIH researchers suggest that it still matters because of an ongoing shift in the economy toward sedentary work.
The more surprising finding is the one that compares full-time workers to people who don’t work. The study shows that men with full-time jobs do more physical activity than healthy men without jobs. ("Healthy men", in this case, were those men who said their primary reason for being out of work—was something other than health or disability.) In fact, even sedentary full- time workers performed more weekday physical activity overall than the healthy non-workers.
The results looked very different for women. Women in sedentary jobs did less physical activity on weekdays than their healthy non-working peers.
So what drives the gender (性别) difference The study looks at the pattems, and unfortunately can’t provide too much detail about their causes. There could be many possible answers, including, perhaps, different abilities to pay for leisure time activities or different attitudes about work and physical activity. It could also be that more non-working women than men are choosing to be at home running around full-time after the kids.
But the NHK researchers do find evidence, they write, to suggest that, whatever causes the difference, healthy non-working women "are replacing work with active pursuits whereas" —for some reason— "non-working men generally are not. \

The study tries to identify ______.

A. the ongoing economy trend
B. evidence for gender differences
C. the American physical activity patterns
D. the relation between work and leisure
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