Moderate drinking reduces stroke risk, study confirms. Similar to the way a drink or two a day protects against heart attacks, moderate alcohol consumption wards off strokes, a new study found.The study also found that the type of alcohol consumed -- beer, wine or liqour -- was unimportant. Any of them, or a combination, was protective, researchers reported in today’s Journal of the American Medical Association. "No study has shown benefit in recommending alcohol consumption to those who do not drink", cautioned the authors, led by Dr. Ralph L. Sacco of Columbia University College of Physicians and Surgeons in New York. But the new data support the guidelines of the National Stroke Association, which say moderate drinkers may protect themselves from strokes by continuing to consume alcohol, the authors said.The protective effect of moderate drinking against heart attacks is well established, but the data has been conflicting about alcohol and strokes, the authors said. The new study helps settle the question and is the first to find blacks and Hispanics benefit as well as whites, according to the authors. Further research is needed among other groups, such as Asian, whom past studies suggest may get no stroke protection from alcohol or may even be put at greater risk.Among groups where the protective effect exists, its mechanism appears to differ from the protective effect against heart attacks, which occurs through boosts in levels of so-called "good" cholesterol, the authors said. They speculated alcohol may protect against stroke by acting on some other blood trait, such as the tendency of blood platelets to clump, which is key in forming the blood trait, such as the tendency of blood platelets to clump, which is key in forming the blood clots that can cause strikes.The researchers studied 677 New York residents who lived in the northern part of Manhattan and had strokes between July 1,1993, and June, 1997. After taking into account differences in other factors that could affect stroke risk, such as high blood pressure, the researchers estimated that subjects who consumed up to two alcoholic drinks daily were only half as likely to have suffered clot-type strokes as nondrinkers. Clot-type strokes account for 80 percent of all strokes, a leading cause of US deaths and disability. Stroke risk increased with heavier drinking. At seven drinks per day, risk was almost triple that of moderate drinkers.An expert spokesman for the American Heart Association, who was not involved in the study, said it was well-done and important information. But it shouldn’t be interpreted to mean, "I can have two drinks and therefore not worry about my high blood pressure or worry about my cholesterol," said Dr. Edgar J. Kenton, an associate professor of clinical neurology at Thomas Jefferson University Medical College in Philadelphia. Instead, he said, the study provides good reason to do further research and to add alcohol to the list of modifiable risk factors for stroke. Which of the following statements is TRUE about the effect of drinking against strokes().
A. Moderate drinking protects against heart attacks and strokes in different ways.
B. Even heavy drinkers suffer less chance of a stroke than non-drinkers.
C. Alcohol works only on patients who suffer clot-type strokes to protect them.
D. White people are more likely to benefit from moderate drinking than nonwhites.
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Oil prices have risen amid growing optimism that improved US job creation will boost economic recovery and lead to higher demand for crude. In the first day of trading after the Easter break, US light crude added 1.51% to reach $86.64 a barrel. London Brent crude also went up 1.42% to $85.70 a barrel. On Friday, the US Labor Department said employers had created 162,000 new jobs in March, the highest monthly number since March 2007. However, the country’s unemployment rate remained at 9.7% for the third month in a row. World oil prices have been on an upward trend in recent weeks — [6]partly because of signs of improvement in the US economy but also because of a weakening dollar, which tends to increase the price of commodities priced in that currency. However, [7]oil prices are still a long way from the record highs above $147 a barrel that they reached in July 2008. Which of the following is the cause of rising oil price().
A. Job creation improvement.
B. High unemployment rate.
C. Signs of economy recovery.
D. A strong dollar.
所有这一切引发了信任危机。美国人不再把繁荣看成是理所当然的事,他们开始相信自己缺乏经营之道,他们相信他们的收入不久也会下降。80年代中期,对美国工业下滑的原因进行了一次又一次的调查,惊人的发现不时的告诫他们,海外的竞争实力越来越强大,情况变化多快呀! 1995年当日本不断奋力拼搏时,美国却可以回顾这五年稳固发展的历程。
University Physics is intended for students of science and engineering. Primary emphasis is on physical principles and problem- (46) ; historical background and specialized practical applications have been given a place of (47) importance. Many worked-out examples and an extensive collection of problems are included within each chapter.In this (48) edition, the basic philosophy and outline and the balance between depth of treatment and (49) of subject-matter coverage are unchanged from previous editions. We have tried to preserve those features that users of (50) editions have found desirable, (51) incorporating a number of changes that should enhance the book’s usefulness.The textbook is adaptable to a wide variety of (52) outlines. The entire textbook can be used for a(n) (53) course two or three semesters in length. For a less intensive course, many instructors will want to (54) certain chapters or sections to tailor the book to their individual needs. The arrangement of this edition facilitates this kind of (55) 49()
The traditional pattern of classroom experience at the college level brings the professor and a group of 20 to 30 students together for a 45-to-50-minute class session two or three times a week. The most common mode of instruction is the lecture. When lectures are the principal method of instruction in larger classes, regular periods may be set aside for small group discussions under the leadership of an assistant instructor. In cases where a small class size encourages in formality, lectures may be combined with discussion sessions based on assigned readings, required textbooks, and other outside materials.Accurate, legible notes are invaluable aids to the student who is enrolled in a lecture course. Notes should be taken during lectures, and when the student is reading the texts prior to each session of the course. The key to good note-taking is to be able to listen a lot and to write only as much as is needed to re- cord the essence of a point or idea presented by the lecturer. Thus, students should endeavor to identify only the main points and ideas being presented and to mite them down in outline form. They should also strive to take good notes the first time and not play to recopy notes--or to do so only when clarity and conciseness demand it. Finally, they should review their notes for about five minutes on the same day that they take them, and go over them again for about half an hour at least once a week, according to a regular schedule or play. There are no course syllabus to be memorized; instead, the examinations will be based on the material presented in the lectures and textbooks. How can a student make good notes().
A. Try to make it clearly.
B. To make it not only in the lecture course, but also before class.
C. Try to listen a lot and write down the main points.
D. All of the above.