当线性表采用顺序存储结构实现存储时，其主要特点是山______。

画一个直径4厘米的圆，再画出它的两条对称轴，使这两条对称轴互垂直．

下列关于风险的说法正确的有()。

A.信用风险是指债务人或交易对手未能履行合同所规定的义务或信用质量

B.市场风险中利率风险尤为重要

C.操作风险是指由于人为错误、技术缺陷或不利的外部事件所造成损失的风险

D.流动性风险包括资产流动性风险和负债流动性风险

E.国家风险发生在国际经济金融活动中，在同一个国家范围内的经济金融活动不存在国家风险

半圆方向60°NE换算成圆周方向为（）。

A．60°

B．120°

C．300°

D．060°

无菌术

The idea that some groups of people may be more intelligent than others is one of those hypotheses that dare not speak its name. But Gregory Cochran is (1) to say it anyway. He is that (2) bird, a scientist who works independently (3) any institution. He helped popularize the idea that some diseases not (4) thought to have a bacterial cause were actually infections, which aroused much controversy when it was first suggested.

(5) he, however, might tremble at the (6) of what he is about to do. Together with another two scientists, he is publishing a paper which not only (7) that one group of humanity is more intelligent than the others, but explains the process that has brought this about. The group in (8) are a particular people originated from central Europe. The process is natural selection.

This group generally do well in IQ test, (9) 12-15 points above the (10) value of 100, and have contributed (11) to the intellectual and cultural life of the West, as the (12) of their elites, including several world-renowned scientists, (13) . They also suffer more often than most people from a number of nasty genetic diseases, such as breast cancer. These facts, (14) , have previously been thought unrelated. The former has been (15) to social effects, such as a p tradition of (16) education. The latter was seen as a (an) (17) of genetic isolation. Dr. Cochran suggests that the intelligence and diseases are intimately (18) . His argument is that the unusual history of these people has (19) them to unique evolutionary pressures that have resulted in this (20) state of affairs.

5（）

A.Only

B.So

C.Even

D.Hence