若A（2x-5，6-2x）在第四象限，求x的取值范围．

正常成人PR间期为（）.

A.0.10～0.20秒

B.0.12～0.20秒

C.0.06～0.08秒

D.0.32～0.44秒

E.0.08～0.22秒

有一域名为www.tsinghua.edu.cn，该域名的类别是（）。

A、教育机构

B、商业系统

C、政府机关

D、军事部门

单釜连续操作，物料在釜内停留时间不一，因而会降低转化率。

我国致力于在（）成为世界科技强国。

A.21世纪中后叶

B.21世纪中叶

C.22世纪中叶

D.22世纪初

At some point during their education, biology students are told about a conversation in a pub that took place over 50 years ago. J. B. S. Haldane, a British geneticist, was asked whether he would lay down his life for his country. After doing a quick calculation on the back of a napkin, he said he would do so for two brothers or eight cousins. In other words, he would die to protect the equivalent of his genetic contribution to the next generation.

The theory of kin selection--the idea that animals can pass on their genes by helping their close relatives--is biology’s explanation for seemingly altruistic acts. An individual carrying genes that promote altruism might be expected to die younger than one with "selfish" genes, and thus to have a reduced contribution to the next generation’s genetic pool. But if the same individual acts altruistically to protect its relatives, genes for altruistic behavior might nevertheless propagate.

Acts of apparent altruism to non-relatives can also be explained away, in what has become a cottage industry within biology. An animal might care for the offspring of another that it is unrelated to because it hopes to obtain the same benefits for itself later on (a phenomenon known as reciprocal altruism). The hunter who generously shares his spoils with others may be doing so in order to signal his superior status to females, and ultimately boost his breeding success. These apparently selfless acts are therefore disguised acts of self interest.All of these examples fit economists’ arguments that Homo sapiens is also Homo economicus--maximizing something that economists call utility, and biologists fitness. But there is a residuum of human activity that defies such explanations: people contribute to charities for the homeless, return lost wallets, do voluntary work and tip waiters in restaurants to which they do not plan to return. Both economic rationalism and natural selection offer few explanations for such random acts of kindness. Nor can they easily explain the opposite: spiteful behavior, when someone harms his own interest in order to damage that of another. But people are now trying to find answers.

When a new phenomenon is recognized by science, a name always helps. In a paper in Human Nature, Dr Fehr and his colleagues argue for a behavioral propensity they call "p reciprocity". This name is intended to distinguish it from reciprocal altruism. According to Dr Fehr, a person is a p reciprocator if he is willing to sacrifice resources to be kind to those who are being kind, and to punish those who are being unkind. Significantly, p reciprocators will behave this way even if doing so provides no prospect of material rewards in the future.

The story of J. B. S. Haldane is mentioned in the text（）

A.to honor his unusual altruistic acts

B. to show how he contributed to his offspring

C. to introduce the topic of human altruism

D. to give an episode of his calculation abilities