大学英语六级考试(又称CET-6,全称为“College English Test-6”)是由国家统一出题的,统一收费,统一组织考试,用来评定应试人英语能力的英语能力的全国性的考试,每年各举行两次。符合大学英语六级考试报名条件的人员包括:全日制普通高校专科、本科和研究生中的在校生;另外,本校已设六级考点,原则上不得跨校考试。大学英语六级考试是一项大规模标准化考试,这种考试属于尺度相关常模参照性考试(criterion-related norm-referenced test),即以教学大纲为考试的依据,但同时又反映考生总体的正态分布情况。

世界最低点面临死亡危机 约以巴三方联手拯救死海2014-11-12
Jordan, Israel, Palestinians join forces to save Dead Sea (2003) Jordan, Israel and the Palestinians are hoping that world leaders gathered on the shores of the Dead Sea this weekend will back their efforts to help save the lowest body of water on Earth.
狗类可能起源于中东地区2014-11-11
Dogs likely originated in the Middle East, not Asia or Europe, according to a new genetic analysis by an international team of scientists led by UCLA biologists.
The air-cushioned vehicle 气垫船2014-11-11
The air-cushioned vehicle is not an airplane, since it does not have wings.It is neither a ship nor an automobile, since it travels clear of sea and land.
吃巧克力保健康?2014-11-10
Cocoa Linked to Lower Risk of Disease The Dutch have a long history with chocolate.
心理压力会导致乳腺癌细胞转移2014-11-10
Psychosocial stress could play a role in the etiology(病因学) of breast cancer aggressiveness, particularly among minority populations.
科学家发现不孕的一项重要因素2014-11-09
Scientists in Mainz and Aachen have discovered a new mechanism that controls egg cell fertility and that might have future therapeutic potential.
完美实现吉他与电脑的互连2014-11-09
Rapidly, but expressively and with amazing ease, the guitarists fingers move over the strings on the neck of the instrument. His fingertips move up and down and a vibrato(颤音) resonates.
中太平洋海域曾存在未知的鲨鱼品种2014-11-08
The Gilbert Island reefs in the Central Pacific were once home to two species of sharks not previously reported in historic records or contemporary studies.
糖尿病检测新方法即将问世2014-11-08
Having discovered a dramatic increase of an easy-to-detect enzyme(酶) in the red blood cells of people with diabetes and prediabetes(前驱糖尿病) , Johns Hopkins scientists say the discovery could lead to a simple.
精神健康相关基因男女不同2014-11-07
Most genes associated with psychiatric illnesses are expressed before birth in the developing human brain, a massive study headed by Yale University researchers discovered.
记忆是如何被保存的2014-11-07
As any student whos had to study for multiple exams can tell you, trying to learn two different sets of facts one after another is challenging.
猫和老鼠一样坏吗?2014-11-06
Britains gardeners have revealed one of their greatest pet hates - other peoples cats. Okay, theyre sadistic murderers - but is it fair that cats have been rated as being as detestable as rats in a poll of British gardeners?
世界上最精确的原子钟问世2014-11-06
A caesium(铯) fountain clock that keeps the United Kingdoms atomic time is now the most accurate long-term timekeeper in the world.
肝癌患者的肝脏移植新标准出台2014-11-05
Researchers at the University of California, San Francisco propose that treatments used on liver cancers beyond the established Milan criteria for liver transplantation may be appropriate for all patients with hepatocellular carcinoma (HCC肝细胞癌) who are listed for transplantation.
格陵兰冰原对海平面上涨的影响日益明显2014-11-05
New research has shown surface ice melt will be the dominant process controlling ice-loss from Greenland. As outlet glaciers retreat inland the other process, iceberg production, remains important but will not grow as rapidly.
教育推动经济发展 而非生育率2014-11-04
A new study published in the journal Demography shows that improvements in education levels around the world have been key drivers of economic growth in developing countries that has previously been attributed to declines in fertility rates.
保持身体健康的十大误区2014-11-04
The girl is striking in face and figure.
中国科学家创造出“人造迷你黑洞”2014-11-03
Chinese researchers have successfully built an electromagnetic(电磁的) absorbing(吸引人的) device for microwave frequencies.
地板材料可影响顾客的购买欲2014-11-03
From teachers to hairdressers, people who stand on their feet all day will tell you that the flooring beneath them can be the difference between a good day and a bad one.
烟草植株改变开花时间以阻止毛虫蚕食2014-11-02
We normally think of pollinators传粉者 as providing a valuable service to plants, and they certainly do. In exchange for作为的交换 nectar花蜜,甘露.
成功老化的秘密2014-11-02
Whether we choose to accept or fight it, the fact is that we will all age, but will we do so successfully?
基因专利阻止了竞争 延缓了创新2014-11-01
Exclusive(排外的,专一的) licenses to gene patents, most of which are held by academic institutions and based on taxpayer-funded research.
移植细胞的生命状态检查2014-11-01
Researchers at Johns Hopkins have devised a way to detect whether cells previously transplanted into a living animal are alive or dead.
戒烟能明显改善呼吸系统健康2014-10-31
If the proven long-term benefits of smoking cessation are not enough to motivate young adults to stop smoking.
微量毒性蛋白质即可诱发脑部疾病2014-10-31
Neurodegenerative(神经变性的) diseases such as Alzheimers could be better understood thanks to insight into proteins linked to such conditions, a study suggests.
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