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问题 单项选择题

Each species has certain______features.

A．distinguish

B．distinguished

C．distinct

D．distinctive

答案

参考答案：D

选择题

下列句子中标点符号使用不正确的一句是（   ）

A．我国古代文人很讲究“炼字”，常常凝神聚思，冥搜苦索，正所谓“吟安一个字，捻断数茎须”。

B．上面我说了三个方面的情形：不注重研究现状，不注重研究历史，不注重马克思列宁主义的应用，这些都是极坏的作风。

C．为了全国人民——当然也包括自己在内——的幸福，我们每个人都要兢兢业业，努力工作。

D．不可思议的人啊!你爱谁?爱父亲母亲，还是兄弟姊妹?
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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. \

What is the function of the accelerometers in the study

A. They record people’s physical activities.
B. They measure people’s workload.
C. They distinguish gender differences.
D. They push people to be more active.
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