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The earliest known galaxies in the universe, which formed during the universe’s "dark age" nearly 13 billion years ago, have been spied by two teams of astronomers. The discoveries, reported separately in this week’s issue of the journal Nature. suggest that galaxies were forming just 700 million years after the birth of the universe. Theory holds that the universe formed 13.7 billion years ago when an extremely dense concentration of mass rapidly expended in an event known as the big bang. The universe has been expanding ever since, so astronomers are able to age galaxies by computing how much. the wavelength of their light has stretched—or redshifted—as the expansion takes the galaxies farther from Earth. The redder the light is, the older and more distant the galaxy is. The detection of such ancient galaxies adds intrigue (神秘色彩) to theories of how the very first galaxies formed, according to astronomers. Were there many large, young galaxies in the early universe that are obscured from astronomers’ view by abundant gases absorbing their light Or were galaxies rare and small way back then, as a prevailing theory suggests, and later clumped together to form larger galaxies such as the Milky Way "We believe that we need both these processes to explain what we see." Masanori lye, a professor at the National Astronomical Observatory of Japan. said in an email. The galaxy, called IOK-1, formed about 750 million years after the big bang--60 million years closer to the event than the previous record holder. Given the number of galaxies found during a later epoch about 810 million years ago, the researchers had expected to find as many as six galaxies like IOK-1 But the comparative rarity(稀有) of objects like IOK-l means that the universe must have changed significantly over the 60 million years that separate the two epochs, the team suggests. lye and colleagues believe that they are witnessing the last phase of a process known as reionization(再次电离). According to Iye, about 380,000 years after the fiery hot big bang, the universe cooled so much that protons and electrons recombined to form neutral hydrogen. This is known as the beginning of the dark age of the universe, because neutral hydrogen absorbs the light from stars. As more galaxies started to form about 300 million years later, the hot stars heated the intergalactic (银河间的) medium and gradually reionized the neutral hydrogen back m protons and electrons. The ionized hydrogen then became more transparent, allowing the galaxies’ light to pass through lye said the new results support the idea that neutral hydrogen was still abundant 750 million years after the big bang, blocking even older galaxies from view. "We are starting to see the last phase of cosmic reionization, or the dawn of the cosmic dark age," he said. lye added that the discovery also supports the "hierarchical" theory of galaxy formation, which suggests that big, bright galaxies formed as smaller galaxies collided and merged. "The epoch we have probed is yet in this critical stage," he said.
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冻结单位或个人存款的期限最长为（），证券监督管理机构申请冻结的期限为（）。
A.三个月；六个月
B.六个月；三个月
C.三个月；三个月
D.六个月；六个月
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下列哪项不属于信用授信的标准（）。
A . 银企合作关系
B . 现金流量
C . 是否在他行开户
D . 信用等级
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有意识地练习坐在前面，能够（）。
A.引起教师和同学们的关注
B.拉近你与台上领导、师长的心理距离
C.集中注意力
D.激发自信心
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当每博输出量增加，而外周阻力和心率变化不大时，血压变化主要表现为：（）。
A.舒张压升高较多
B.收缩压升高较多
C.脉压增加
D.脉压减小
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Some of the students in this class seem （）to help those who have difficulties in their studies.
A.willing
B.reluctant
C.reliable
D.responsible
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农民工月工资收入的矩偏度系数和矩峰度系数。
为了了解农民工每月工资收入的情况，某市在全市农民工中随机抽取了300名进行调查，调查得样本资料如下表：
根据表中的样本数据计算下列各种分布特征测度指标。
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要了解有关国家的领馆及其人员所享有的特权和豁免，可查阅( )。 A．1961年《维也纳公约》 B．1975年《维也纳
A.1961年《维也纳公约》
B.1975年《维也纳公约》
C.1963年《维也纳公约》
D.双边领事条约
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逐渐成为人类社会的主要空间形态与经济发展的主要空间载体的是（）
A.工业B.城市C.农业D.乡村
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杰克逊（Jackson）癫儿属于（）
A . 部分运动性发作
B . 复杂部分性发作
C . 体觉性发作
D . 精神性发作
E . 全面性发作
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国有企业、集体企业以及其他所有制形式的企业经重组改制为股份有限公司后，向中国证监会提出境外上市申请，净资产不少于（）亿元人民币，过去1年税后利润不少于（）万元人民币。
A.5；5000
B.4；6000
C.3；500
D.2；600
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掘进机较大的机件是机体，在平板车上的捆绑方法是（）。
A.加垫
B.用钢丝捆牢
C.用钢丝绳扣拉紧
D.用反正扣丝杆拉紧
E.用链式起重机拉紧
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According to the writer the agenda is important because itA．is seen by everybody before th
According to the writer the agenda is important because it A．is seen by everybody before the meeting. B．helps to give direction to the discussions. C．contains items of interest to all those present. D．shows who should speak at each stage of the meeting.
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定量决策方法常用于数量化决策，定量决策的方法主要包括确定型决策，（）和不确定性决策三种。
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近尾州水情测报系统规模是（）。
A.1：2：16 B.1：2：12 C.1：2：13 D.1：3：15
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