经纬仪整平的目的是（ ）处于铅垂位置。

   Health experts have called adolescents to avoid salty diets, warning that such diets were capable of causing hypertension (高血压), as they grow older. The experts, who spoke in Lagos during cardiovascular (心血管的) grass root programme organised by Chike Okoli Foundation in collaboration with Lagos State Ministry of Education for over 1,000 senior secondary students (SSS) of Dairy Farm Senior Secondary School, Lagos, also urged adolescents to be mindful of their lifestyles as whatever they do today have future implications on their heart.
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/    The grass root programme is an annual event aimed to educate, create awareness and screen students in secondary school of heart related diseases in memory of Chike Okoli, who died at the age of 25 of cardiovascular disease. This year, the programme is targeting over 10,000 students in Lagos public schools.
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/    Public health physician and resident doctor at the university of Lagos Teaching Hospital (LUTH), Dr Idiakhoa Iyare, who was one of the guest lecturers for the programme, said the importance of the cardiovascular grass root programme could not be over emphasised as exposing young ones to implications of their lifestyles would save them from deaths and sufferings that could result from future cardiovascular diseases. "If we call hypertension a silent killer, it means that it is going to be silent for along time," Iyare said. " But if we could make the children get aware earlier and start focusing on healthy ways of living while they are much younger, it would be easier for them to modify their habits while they are young."
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/    Programme Coordinator of Chike OkoliFoundation, Mrs. Beaty Alfred, said that the programme was important to raise the health status of students in Lagos schools because "we believe that they are ignorant of the implications of some of their lifestyles," adding that "we want to catch them young."
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/The students were taken through series of lectures on the causes, implications and how to avoid hypertension by various experts from LUTH. Blood pressures of the students were also measured. Iyare added that hypertension is different from high blood pressure, which could arise from increased activities. The public health physician said:"Hypertension is a persistently elevated blood pressure. That means that the blood pressure is greater than 140-millimetre mercury systolic blood pressure and greater than 90-millimetre mercury diastolic blood pressure."

某指标呈正态分布，均值等于20，变异系数等于10%，则其95%参考值范围是( )

    For reasons that are deeply rooted in culture and tradition, men significantly outnumber women in mathematics-based careers. As students progress through the mathematics courses, girls and boys show little difference in ability, effort, or interest in mathematics until adolescent years when course and career choices begin influencing school effort. Then, as social pressure increases and career goals are formed, girls' decisions to reduce effort in the study of mathematics progressively cut them off from many professional careers in the future. 
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/    Many girls drop mathematics in high school or in the transition to college. Others drop out later. Women perform virtually as well as men in college mathematics courses, but beyond the bachelor's degree women drop out of mathematics at twice the rate of men. Women now enter college nearly as well prepared in mathematics as men, and 46 percent of mathematics baccalaureates (学士学位）go to women. Despite this record, only 35 percent of the master's degrees and 17 percent of the Ph. D degrees in the mathematical sciences are earned by women. 
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/    Overall, women receive approximately one third of university degrees in science and engineering. The highest percentages of women are found in those sciences with the least mathematical prerequisite: psychology, biology, and sociology. The lowest percentages of women enter fields requiring the most mathematics, namely, physics, engineering, economics, geo-science, and chemistry. Evidence from many sources suggest that it is differences in course patterns rather than lack of ability that matter most in limiting women's access to careers in mathematically intensive sciences. 
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/Widely reported studies concerning the high percentage of boys among mathematical prodigies ( 天才. —those who at age 12 perform at the level of average college students—often convey the impression that gender differences in mathematics are biologically determined. But evidence from the vast majority of students shows almost no difference in performance among male and female students who have taken equal advantage of similar opportunities to study mathematics. Inferences ( 推论）from very exceptional students—child prodigies—mean little about the performance of the general population. 

    Teaching children to read well from the start is the most important task of elementary schools. But relying on educators to approach this task correctly can be a great mistake. Many schools continue to employ instructional methods that have been proven ineffective. The staying power of the "look-say" or "whole-word" method of teaching beginning reading is perhaps the most flagrant example of this failure to instruct effectively.
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/    The whole-word approach to reading stresses the meaning of words over the meaning of letters, thinking over decoding,developing a sight vocabulary of familiar words over developing the ability to unlock the pronunciation of unfamiliar words. It fits in with the self-directed, "learning how to learn" activities recommended by advocates ( 倡导者) of "open" classrooms and with the concept that children have to be developmentally ready to begin reading. Before 1963, no major publisher put out anything but these "Run-Spot-Run" readers.
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/    However, in 1955, Rudolf Flesch touched off what has been called "the great debate" in beginning reading. In his best-seller Why Johnny Can't Read, Flesch indicted (控诉) the nation's public schools for miseducating students by using the look-say method.He said--and more scholarly studies by Jeane Chall and Rovert Dykstra later confirmed--that another approach to beginning reading, founded on phonics (语音学), is far superior.
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/    Systematic phonics first teaches children to associate letters and letter combinations with sounds; it then teaches them how to blend these sounds together to make words. Rather than building up arelatively limited vocabulary of memorized words, it imparts a code by which the pronunciations of the vast majority of the most common words in the English language can be learned. Phonics does not devalue the importance of thinking about the meaning of words and sentences; it simply recognizes that decoding is the logical and necessary first step.

    Gestures aren't the only area in which the unwary traveler can get tripped up. Foreign cultures adhere to different business customs and behavior. For example, Caffeine junkies should restrain themselves in the Middle East. "Three cups of tea or coffee is usually the polite limit in offices and during social calls," counsels "Travel Pak," a free publication of Alia, the Royal Jordanian Airline. "Butif your host keeps going, you also may continue sipping. If you're had your fill, give your empty cup a quick twist a sort of wiggle--as you hand it back.That means "No more, thank you."
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/    Middle East visitors also should not be surprised "if others barge into the office in the middle of your conversation with the person you are seeing," notes "Travel Pak." An old Arab custom calls for keeping an "open office." The British, however,consider it impolite to interrupt a visitor, even after all business has been transacted. The commercial caller is expected to be sensitive to this point,know when to stop, and initiate his or her own departure. In Japan certain guests at evening business gatherings will leave early. They should be allowed to leave without effusive goodbyes. The Japanese consider formal departures to be disruptive in such cases and disturbing to remaining guests. In Scandinavia and Finland business guests may be asked to shed their clothes and join their hosts in a sauna.
style=color: rgb(51, 51, 51); font-family: "Microsoft YaHei"; white-space: normal; background-color: rgb(250, 250, 250);/    The invitation is a sign that a good working relationship has been established. In the Arab world, the word"no" must be mentioned three times before it is accepted. In contrast, it is considered good business manners to make many and long efforts to pick up the check. In the People' s Republic of China, gift giving is considered an insult, says Patrick J. Lewis, President of Club Universe, a Los Angeles tour operator. "If you want to give someone a gift, make sure it's modest in value. This will not be considered offensive. but it may be declined," The Chinese manner of expressing friendship and welcome is to clap. Lewis adds. "You may be greeted with clapping when entering a factory,hospital, commune, or school. Politeness dictates that you respond with applause, even though it may seem like you're clapping for yourself."