相关考题
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单项选择题
随着耐力运动的进行和肝糖原贮备的下降，维持血糖水平恒定是主要靠( )。 A．肌糖原分解为葡萄糖 B．乳酸、丙酮酸、甘油等在肝内的糖异生作用 C．脂肪酸转变为糖 D．生糖氨基酸转变成糖
A.肌糖原分解为葡萄糖
B.乳酸、丙酮酸、甘油等在肝内的糖异生作用
C.脂肪酸转变为糖 -
未知题型
For centuries in Spain and Latin America, heading home for lunch and a snooze with the family was some thing like a national right, but with global capitalism standardizing work hours, this idyllic habit is fast becoming an endangered pleasure. Ironically, all this is happening just as researchers are beginning to note the health benefits of the afternoon nap. According to a nationwide survey, less than 25 percent of Spaniards still enjoy siestas. And like Spain, much of Latin America has adopted Americanized work schedules, too, With shortened lunch breaks to one hour and requiring its employees to work their eight-hour shift between 7 a. m Before the mandate, workers would break up the shift--going home midday for a long break with the family and returning to work until about 9 or 10 p.m. The idea of siesta is changing in Greece, Italy and Portugal, too, as they rush to join their more 'industrious' counterparts in the global market. Most Americans I know covet sleep, but the idea of taking a nap mid-afternoon equates with laziness, un employment and general sneakiness. Yet according to a National Sleep Survey poll, 65 percent of adults do not get enough sleep. Numerous scientific studies document the benefits of nap taking, including one 1997 study on the deleterious effects of sleep deprivation in the journal Internal Medicine. The researchers found that fatigue harms not only marital and social relations but worker productivity. According to Mark Rosekind, a former NASA scientist and founder of Solutions in Cupertino, Calif. , which educates businesses about the advantages of sanctioning naps, we're biologically programmed to get sleepy between 3 and 5 p. m. and 3 and 5 a.m. Our internal timekeeper-called the circadian clock--operates on a 24-hour rotation and every 12 hours there's a dip. In accordance with these natural sleep rhythms, Rosekind recommends that naps be either for 40 minutes or for two hours. Latin American countries, asserts Rosekind, have had it right all along. They've been in sync with their clocks; we haven't. Since most of the world is sleep-deprived, getting well under the recommended eight hours a night (adults get an average of 6. S hours nightly), we usually operate on a kind of idle midday. Naps are even more useful now that most of us forfeit sleep because of insane work schedules, longer commute times and stress, In a study published last April, Brazilian medical researchers noted that blood pressure and arterial blood pressure dropped during a siesta.In the second sentence of Para. 1, the underlined words 'all this' refers to ______.A．the habit of nappingB．the standardizing of work hoursC．the decline of the siesta traditionD．the growth of global capitalism
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B.m.
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未知题型
延伸预测法包括( )等,其基本方法是时间序列预测。
A.简单移动平均法
B．指数平滑法
C．成长曲线模型
D．季节波动模型
E．回归分析法
