题目内容
（请给出正确答案）
"The twilight of their years" (Line 5, Para. 5) refer to______.
A．their old years
B．their young years
C．their good years
D．their bad years
如果结果不匹配，请 联系老师 获取答案
更多“"The twilight of their years" …”相关的问题
Because of sleep loss, most American
A．have wide open eyes
B．are not fully alert
C．try to sleep more
D．live in the twilight zone
A．at dusk
B．at noon
C．in the spring
D．in the fall
Because of sleep loss, most Americans______.
A．have wide open eyes
B．are not fully alert
C．try to sleep more
D．live in the twilight zones
A．he is all expensive public servant
B．he must always behave with absolute legality
C．he is forced to break the law in order to preserve it
D．he feels himself to be cut off from the rest of the world
Which of the following is INCORRECT？
A．It is really hard to explain why dogs and cats are colorblind.
B．Some colorblind animals have dull-colored coats.
C．Some colorblind animals hunt for food in the dark of night.
D．Some colorblind animals graze in the dim twilight hours.
听力原文： Not until somewhat recently(that is, in terms of human history) did people find a need for knowing the time of day. As best we know, 5,000 to 6,000 years ago great civilizations in the Middle East and North Africa initiated clock-making. With their bureaucracies and formal religions, these cultures found a need to organize their time mom efficiently.
The Egyptians were the next to formally divide their day into parts something like our hours. Obelisks(slender, tapering, four-sided monuments) were built as early as 3500 B.C. Their moving shadows formed a kind of sundial, enabling citizens to partition the day into two parts by indicating noon. They also showed the year's longest and shortest days when the shadow at noon was the shortest or longest of the year. Later, markers added around the base of the monument would indicate further time subdivisions.
Another Egyptian shadow clock or sundial, possibly the first portable timepiece, came into use around 1500 B.C. to measure the passage of "hours". This device divided a sunlit day into 10 parts plus two "twilight hours" in the morning and evening. When the long stem with 5 variably spaced marks was oriented east and west in the morning, an elevated crossbar on the east end east a moving shadow over the marks. At noon, the device was turned in the opposite direction to measure the afternoon "hours".
In the quest for more year-round accuracy, sundials evolved from flat horizontal or vertical plates to more elaborate forms. One version was the hemispherical dial, a bowl-shaped depression cut into a block of stone, carrying a central vertical gnomon(pointer) and scribed with sets of hour lines for different seasons. The hemicycle, said to have been invented about 300 B.C., removed the useless haft of the hemisphere to give an appearance of a half-bowl cut into the edge of a squared block.
(33)
A．4,000-5,000.
B．50-60,000.
C．500-600.
D．5,000-6,000.
听力原文：Not until somewhat recently (that is, in terms of human history) did people find a need for knowing the time of day. As best we know, 5,000 to 6,000 years ago great civilizations in the Middle East and North Africa initiated clock-making. With their bureaucracies and formal religions, these cultures found a need to organize their time mom efficiently.
The Egyptians were the next to formally divide their day into parts something like our hours. Obelisks (slender, tapering, four-sided monuments) were built as early as 3500 B.C. Their moving shadows formed a kind of sundial, enabling citizens to partition the day into two parts by indicating noon. They also showed the year's longest and shortest days when the shadow at noon was the shortest or longest of the year. Later, markers added around the base of the monument would indicate further time subdivisions.
Another Egyptian shadow clock or sundial, possibly the first portable timepiece, came into use around 1500 B.C. to measure the passage of "hours". This device divided a sunlit day into 10 parts plus two "twilight hours" in the morning and evening. When the long stem with 5 variably spaced marks was oriented east and west in the morning, an elevated crossbar on the east end east a moving shadow over the marks. At noon, the device was turned in the opposite direction to measure the afternoon "hours".
In the quest for more year-round accuracy, sundials evolved from flat horizontal or vertical plates to more elaborate forms. One version was the hemispherical dial, a bowl-shaped depression cut into a block of stone, carrying a central vertical gnomon (pointer) and scribed with sets of hour lines for different seasons. The hemicycle, said to have been invented about 300 B. C. , removed the useless haft of the hemisphere to give an appearance of a half-bowl cut into the edge of a squared block.
(33)
A．4,000-5,000.
B．50-60,000.
C．500-600.
D．5,000-6, 000.
They say females have two separate cell lines in their bodies, while men have only one. Women in old age can "choose" the more robust (强壮的) of these lines and survive for many more years.
Why there should be such a persistent cross-cultural gap between the life spans of the sexes has baffled scientists until now. In a paper in the journal Blood, and reported in the current issue of New Scientist, researchers at Odense University in Denmark and Ulleval University Hospital in Norway point to a key difference in the sex-determining chromosomes (染色体) found in the cells of men and women.
Every cell in a woman's body has two X chromosomes, one inherited from her mother and the other from her father. In each cell, one of these two X chromosomes is switched off. This means that a woman is a mosaic (混合体) of two cell lines: one derived from her father's X chromosome, the other from her mother's. By contrast, every cell in a man's body has an X and a Y chromosome, neither of which is turned off. He has only one cell line. This difference could be crucial in determining the long-term health of men and women, scientists concluded, and so they decided to examine cells taken from young women.
They found an even division between their two different lines. However, when they looked at elderly females they found their bodies now favoured one set of cells at the expense of the other line. "This suggests that one of the cell lines is 'better' than the other," say the researchers. In other words, women's bodies may select the more vigorous of the two cell lines and allow it to predominate the twilight of their years, giving them a crucial advantage over men, who have no chance of choosing the healthier of two sets of cells.
Women enjoy a longer life than men because______.
A．women are entitled to longevity
B．women are favoured by God
C．women are born to be so
D．women are spoiled in the world
A typical adult needs about eight hours of shut-eye a night to function effectively. By that standard, millions of Americans are for a long time sleep deprived, trying to get by on six hours or even less. In many households, cheating on sleep has become an unconscious and harmful habit. "In its mild form, it's watching Ted Koppel and going to bed late and then getting up early to get to the gym, "says Cornell's Pollak. In extreme cases people stay up most of the night, seeing how little sleep will keep them going. They try to compensate by short sleeping late on weekends, but that makes up for only part of the shortfall. Over the months and years, some researchers believe, the imbalance builds up and the effects accumulate. "Most Americans no longer know what it feels like to be fully alert, " contends Dr. William Dement, director of Stanford University's Sleep Center. They go through the day in a sort of twilight zone; the eyes may be wide open, but the brain is partly shut down.
Single parent Dianna Bennett, 43, works as a nurse at a correctional facility in Gardner, Mass. To be able to spend time with her three children during the day, she works the night shift, a schedule that usually allows her no more than four hours of sleep, "My kids tell me I'm always tired," she says. Amy Schwartzman, 35, a law student at Tulane University, gets up at 9 a.m. and, what with classes, simulated court and work as a research assistant, often does not get home until 10 p.m. That's when she studies or relaxation. Nights of throwing into bed at 3 a.m. make her feel "as if my brain isn't moving as quickly as quickly as it should." says Schwartzman, noting that the circles under her eyes keep getting darker. "My mother told me I look like a raccoon."
Sleep loss contributes to everything except______.
A．drug abuse
B．poor school grades
C．work effect
D．accidents
根据材料请回答 31～35
Sleep Loss and Its Effects
Mental fatigue can be as threatening as a heart attack.Recent evidence indicates that sleepiness is a leading cause of traffic and industrial accidents.“Human error causes be-tween 60% and 90%of all workplace accidents, depending on the type of job,” observes biological psychologist David Dinges of the University of Pennsylvani
A．“And inadequate sleep is a major factor in human error.” Other research suggests that sleep loss contributes to everything from drug abuse to poor grades in school.
A typical adult needs about eight hours of shut-eye a night to function effectively.By that standard, millions of Americans are for a long time sleep deprived, trying to get by on six hours or even less.In many household, cheating on sleep has become an unconscious and harmful habit."In its mild form, it's watching Ted Koppel and going to bed late and then getting up early to get to the gym," says Cornell's Pollak.In extreme cases people stay up most of the night, seeing holy little sleep will keep them going.They try to com-pensate by sleeping late on weekends, but that makes up for only part of the shortfall(不足).Over the months and years, some researchers believe, the imbalance builds up and.the effects accumulate.“Most Americans no longer know what it feels like to be fully a-lert,” contends Dr.William Dement, director of Stanford University' s Sleep Center.
They go through the day in a sort of twilight zone; the eyes may be wide open, but the brain is partly shut down.
Single parent Dianna Bennett, 43, works as a nurse at a correctional facility(管教所)in Gardner, Mass.To be able to spend time with her three children during the day, she works the night shift, a schedule that usually allows her no more than four hours of sleep,“My kids tell me I am always tired,” she says.Amy Schwartzman, 35, a law student at Yale University, gets up at 9
A．m.and then, she attends classes and simulated(模拟的)court and work as a research assistant, often does not get home until 10 p.m.Nights of throwing into bed at 3
A．m.makes her feel "as if my brain isn't moving as quickly as it should be." Noting that the circles under her eyes keep getting darker,"My mother told me I look like.a raccoon(浣熊)." says Schwartzman.
第 31 题 Sleep loss contributes to everything EXCEPT
A．drug abuse
B．poor school grades
C．work effect
D．accidents
