关于多胎妊娠的超声和临床表现，下列哪一项是错误的： A．多胎妊娠中双胎多见 B．多

有一位优秀的班主任，为了培养学生的自觉性和良好的学习行为习惯，在自修课上组织了一次无人监考的英语测验。测验结束后班长向他汇报，说测验情况一切正常。但是，班主任认为以这个班的学生行为规范水平还不能达到在无人监考下一切正常的程度。后来经过了解，得知这次测验看书的人不少，连班干部也看了。为了纠正学生的行为，班主任制订了启发学生自觉改正错误的教育方案。

第二天，他在黑板上写下了汤姆斯·麦考莱的一句名言：“在真相永远无人知道的情况下，一个人的所作所为，能显示他的品格。”他要求学生把这句名言背下来，并给学生讲了一个在学生时代作过弊的人三十年后十分悔恨的故事，同时要求每个学生都写一篇体会，题目是《心灵答卷》。

在答卷中，有的学生写道：“作弊发生后，老师没有批评我们，但在背名言时，我的心情比挨了打还要难受。我将永远记住这次错误，永远记住班主任老师对我们的教诲。”有的写道：“教师在与不在一个样儿，说说容易，做到却有点难。测验时我有一道10分的．题目做不出，分数的诱惑使我一念之差，犯了令我终身懊悔的错误——偷看了书本。

我的英语考卷虽然得了好分数，但在道德答卷中却得了零分。”还有的学生写道：“本来我不打算看书的，但是在看到有的同学看书时，我也跟着看了，我感到内心有愧。”全班共有22个同学在答卷中承认了测验时翻书的错误。接着班主任又把这些答卷制成了录音带，取名《心声》，让同学们在听录音时再一次接受教育。

案例中教师的做法，遵循了()。

A．导向性原则

B．疏导原则

C．教育的一致性与连贯性原则

D．因材施教原则

非专利技术是指（）的知识和技巧。

A.申请法律认证

B.具有法定权利

C.未经公开

D.代表先进技术

E.未申请专利

We can begin our discussion of “population as a global issue” with what most person mean when they discuss “ the population problem”: too many people on earth and a too rapid increase in the number added each year. The facts are not in dispute. It was quite right to employ a similar matter that linked demographic(人口统计学）growth to “ a long, thin power fuse that burns steadily from time to time until it finally reaches the limit, and explodes”.

To understand the current situation, which is characterized by rapid increases in population, it is necessary to understand the history of population trends. Rapid growth is a comparatively recent phenomenon. Looking back at the 8,000 years of demographic history. We find that population have been really stable or growing very slightly for most of human history. For most of our ancestors, life was hard, often nasty, and very short. For most of human history, it was seldom the case that one in ten persons would live past forty, where infancy and childhood were especially risky periods. Often, societies were in clear danger of extinction because death rates could exceed their birth rates. Thus, the population problem throughout most of history was how to prevent extinction of the human race.

This pattern is important to know. Not only does it put the current problems of demographic growth into a historical perspective, but it suggests that the cause of rapid increase in population in recent years is not a sudden enthusiasm for more children, but an improvement in the conditions that traditionally have caused high rate of death.

Demographic history can be divided into two major periods: a time of long, slow growth which extended from about 8000B.C. till approximately 1650 A.D. And a period of rapid growth since 1650. In the first period of some 9,600 years, the population increased form some 8 million to 500 million in 1650. Between 1650 and the present, the population has increased from 500 million to more than 4 billion. And it is estimated that by the year 2020 there will be 8 billion people throughout the world. One way to appreciate this dramatic difference in such abstract numbers is to reduce the time frame to something that is more manageable. Between 8000B.C. and 1650, an average of only 50,000 persons was being added annually to the world’s population each year. At present, this number is added very six hours. The increase is about 80,000,000 persons annually.

小题1:According to the passage, “population as a global issue” ____.

A．is quite unlike the population problem and thus doesn’t need our concern

B．focuses on tracking down the reason of rapid population growth

C．deals with the same problem aroused by the population problem

D．will manage the population growth problem from global perspectives小题2:It can be inferred from the example of a power fuse that _____.

A．too much population will one day lead to the doom of human beings

B．the trend of population growth will keep unsteady until the destruction of Earth

C．demographic growth will follow a certain pattern of ups and downs

D．it is likely in the near future that population will reduce gradually小题3:What leads to a stable growth of population for most of human history?

A．Species competition

B．Low fertility

C．Tribal fights

D．High rate of death小题4:The reason for a rapid growth of population lies in the fact that ______.

A．people are permitted to have more children

B．people can live better than before

C．newborn babies die less than before

D．we have found the secret of longevity小题5:How many people are born every six hours at present, according to the author?

A．Eighty million.

B．Eight thousand

C．Fifty thousand

D．Five million

患者，女，30岁，带下量多，时夹血丝，妇检宫颈外口可见一舌样0．9×0．6cm大小鲜红色赘生物，触之柔软，余未见异常。应诊断为（）

A.子宫黏膜下肌瘤

B.宫颈糜烂

C.宫颈腺体囊肿

D.宫颈肥大

E.宫颈息肉

下列哪一个是亲水凝胶骨架片的材料

A．硅橡胶

B．聚氯乙烯

C．脂肪

D．海藻酸钠

E．硬脂酸钠