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问题 问答题 简答题

甲型肝炎的发病与年龄、性别、季节有何关系？

答案

参考答案：

我国大部分地区甲型肝炎的发病率以儿童和青少年为最高，2～4岁为高峰，15岁以上既显著降低。在儿童中男、女发病率基本相等，而在成人中则男多于女。我国甲型肝炎的发病，有明显的秋、冬季高峰。在非流行年，其季节高峰明显；在流行年，则季节高峰不明显。

单项选择题

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.

13（）

A.affirm

B.witness

C.observe

D.approve
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判断题

情绪的产生跟人的心理需要有密切的关系，它受客观条件的直接影响，也受本人生活方式、文化修养、宗教信仰等因素的制约和影响。
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