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Taking a Nap during the Day Medical experts say most Americans do not get {{U}} (51) {{/U}} sleep. They say more Americans need to rest for a short period in the middle of the day. They are advising people to sleep lightly before {{U}} (52) {{/U}} with other activities. One study earlier this year found that persons who sleep for a few minutes during the day were less {{U}} (53) {{/U}} to die of disease. The study followed more than 2,300 Greek adults {{U}} (54) {{/U}} about six years. Adult who rested for half an hour {{U}} (55) {{/U}} three times a week had a 37 percent lower risk of dying from heart disease than those who did not nap. Study organizers said the strongest evidence was in working men. They said naps might improve A. unless B. while C. until D. during [单选题]金融衍生工具的基本特征包括()
Ⅰ杠杆性
Ⅱ跨期性
Ⅲ不确定性或高风险性
Ⅳ投机性
A.Ⅰ、Ⅱ、Ⅲ B.Ⅱ、Ⅲ、Ⅳ C.Ⅰ、Ⅳ D.Ⅰ、Ⅱ、Ⅲ、Ⅳ [单项选择]The collapse of the Earth’s magnetic field—which guards the planet and guides many of its creatures—appears to have started seriously about 150 years ago, the New York Times reported last week.
The field’s strength has decreased by 10 or 15 per cent so far and this has increased the debate over whether it signals a reversal of the planet’s lines of magnetic force. During a reversal, the main field weakens, almost vanishes, and reappears with opposite polarity. The transition would take thousands of years. Once completed, compass needles that had pointed north would point south. A reversal could cause problems for both man and animals. Astronauts and satellites would have difficulties. Birds, fish and animals that rely on the magnetic field for navigation would find migration confusing. But experts said the effects would not be a big disaster, despite claims of doom and vague evidence of links between past field reversals and species extinctions. Although a total transiti A. we should not worry about the transition of the Earth’s magnetic field B. the Earth’s magnetic field will not change for at least 2 000 years C. the Earth’s magnetic field has decreased its strength rapidly D. the transition of the Earth’s magnetic field can be controlled by modern science [单选题]取得工程勘察劳务资质的企业，不可以承接( )勘察劳务业务。
A.岩土工程治理 B.凿井工程 C.工程钻探 D.海洋工程 [单项选择]中期国债的偿还期限一般为( )年。
A. 1～5 B. 5～10 C. 1～10 D. 10～15 [单项选择]按照编制用途的不同，财务报表可分为（ ）。
A. 内部报表和外部报表 B. 静态报表和动态报表 C. 个别会计报表和合并会计报表 D. 月报、季报和年报 [多项选择]医学心理学研究的困难在于除了（）
A. 概念可以精确地定义 B. 变量难以精确地界定 C. 心理现象较客观 D. 心理现象随意性小 E. 研究涉及的因素不多 [单项选择]逮捕犯罪嫌疑人、被告人，只能由( )执行。
A. 公安机关 B. 人民检察院 C. 人民法院 D. 犯罪嫌疑人、被告人所在单位的保卫部门 [简答题]货车滚动轴承用新晶橡胶油封的基本内径(d)、基本外径(D)不得有气泡、杂质和凹凸缺陷。
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