企业在追加投资或融资过程中，后期发行的股票价格低于前期发行价格，前期投资者有权免费获取一定数额的新股或调整其转换比例，属于（  ）。

机体抗外毒素的免疫主要依靠

(2015四川)学生学会在听课和看书时如何做笔记属于策略性知识。()

生物因素和社会因素是学前儿童心理发展必不可少的条件，统称为客观因素。下列关于学前儿童心理发展客观因素的描述不正确的是（  ）。

根据《医疗器械监督管理条例》，将医疗器械分为第一类，第二类，第三类的依据是（ ）

小儿年龄分期中婴儿期是指

总结了春秋战国时期的数学成就，奠定了我国古代数学以计算为中心的特点的著作是(  )。

某交易者根据供求状况分析判断，将来一段时间棉花期货远月合约上涨幅度要大于近月合约上涨幅度，该投资者最有可能获利的操作是牛市套利。(    )

Passage1

   Lonely people, it seems, are at greater riskthan the gregarious of developing illnesses associated with chronicinflammation, such as heart disease and certain cancers. A paper published lastyear in the Public Library of Science, Medicine, shows the effect on mortalityof loneliness   is comparable with thatof smoking and drinking after examining the results of 148 previous studies andcontrolled for factors such as age and pre-existing illness.

Steven Cole of the University ofCalifornia, Los Angeles, thinks he may know why this is so. He told theAmerican Association for the Advancement of Science meeting in Washington,D.C., about his work studying the expression of genes in lonely people. Dr.Cole harvested samples of white blood cells from both lonely and gregariouspeople. He then analysed the activity of their genes, as measured by theproduction of a substance called messenger RNA. This molecule carries    instructions from the genes telling a cellwhich proteins to make. The level of messenger RNA from most genes was the samein both types of people. There were several dozen genes, however, that wereless active m the lonely, and several dozen others that were more active.Moreover, both the     less active andthe more active gene types came from a small number of functional groups.

   Broadly speaking, the genes less active in thelonely were those involved in staving off viral infections. Those that weremore active were involved in protecting against bacteria. Dr. Cole suspectsthis could help explain not only why the lonely are iller, but how, inevolutionary terms, this odd state of affairs has come about.

    The crucial bit ofthe puzzle is that viruses have to be caught from another infected individual andthey are usually species-specific. Bacteria, in contrast, often just lurk inthe environment, and  may thrive on manyhosts. The gregarious are therefore at greater risk than the lonely ofcatching  viruses, and Dr. Cole thussuggests that past evolution has created a mechanism which causes white cellsto respond appropriately. Conversely, the lonely are better off ramping uptheir protection  against bacterialinfection, which is a bigger relative risk to them.

     What Dr. Cole seemsto have revealed, then, is a mechanism by which social environment reachesinside a person's body and tweaks its genome so that it responds appropriately.It is not that the lonely and the gregarious are genetically different fromeach other. Rather, their genes are regulated differently, according to howsociable an individual is. Dr. Cole thinks this regulation is part of a widermechanism that tunes individuals to the circumstances they find themselves in.

What can we know about viruses and bacteria from the fourth paragraph?

1930年夏，我国最大的革命根据地是（）。

工程质量监督机构发现其监督的工程有影响使用功能的质量问题时，应采取的监督措施是（ ）。