TIPSS治疗禁忌证，错误的是（） A.肝性脑病前兆 B.中重度肝功能异常 C.严重

用调好平衡的托盘天平测物体A的质量，在测量过程中若指针静止在如图（1）所示的位置，只调节游码，则应向______调，（选填“左”或“右”）天平才可能平衡。当指针静止在中央刻度线上，天平使用的砝码和游码的位置如图（2）所示，则物体A的质量为______g。

为了鉴别某金属块的材料，小明通过实验来测定金属块的密度．

（1）调节天平横梁平衡时，发现指针在分度标尺上的位置如图甲所示，此时应将横梁右端的平衡螺母向______（选填“左”或“右”）移动．

（2）将金属块放在已调节好的天平的______盘中，称其质量，所用的砝码和游码的位置如图乙所示时，指针恰好指在分度盘的中央，则被测金属块的质量为______g．用排水法测出该金属块的体积为20cm³，金属块的密度为______g/cm³．

（3）算出它的密度后查表可知该金属可能是______．

彩色电视机电源电路采用光耦合器件的目的为了实现冷热底板的隔离。

脆弱性分析的目的是要明确一旦发生事故，其周边哪些地方或哪些人员容易受到破坏或伤害，其中包括对敏感人群的分析。下列人群中，属于敏感人群的是（）。

A.电影院里的观众

B.精神病院的病人

C.学校的学生

D.商场内的顾客

E.养老院里的老人

The first two stages in the development of civilized man were probably the invention of primitive weapons and the discovery of fire, although nobody knows exactly when he acquired the use of the latter.
41) ______ Animals have a few cries that serve as signals, but even the highest apes have not been found able to pronounce words, even with the most intensive professional instruction. The superior brain of man is apparently a necessity for the mastering of speech. When man became sufficiently intelligent, we must suppose that he gradually increased the number of cries for different purposes. It was a great day when he discovered that speech could be used for narrative. There are those who think that in this respect picture language preceded oral language. A man could draw a picture on the wall of his cave to show in which direction he had gone, or what prey he hoped to catch. 42) ______
Two important stages came not so long before the dawn of written history. The first was the domestication of animals; the second was agriculture. Agriculture made possible an immense increase in the number of the human species in the regions where it could be successfully practiced. 43) ______
44) ______
These inventions and discoveries--fire, speech, weapons domestic animals, agriculture, and writing--made the existence of civilized communities possible. From about 3000 B. C. until the beginning of the Industrial Revolution less than two hundred years ago there was no technical advance comparable to these. During this long period man had time to become accustomed to his technique, and to develop the beliefs and political organizations appropriate to it. There was, of course, an immense extension in the area of civilized life. At first it had been confined to the Nile, the Euphrates, the Tigris, and the Indus, but at the end of the period in question it covered much the greatest part of the inhabitable globe. I do not mean to suggest that there was no technical progress during the time. 45) ______ (512 words)
Notes: ape 猿。pastoral nomad 田园式的游牧部落的人。the Euphrates 幼发拉底河。the Tigris底格里斯河。the Indus 印度河。in question 所谈的(在名词后作后置定语)。
[A] Probably picture language and. oral language developed side by side. I am inclined to think that language has been the most important single factor in the development of man.
[B] Another fundamental technical advance was writing, which, like spoken language, developed out of pictures, but as soon as it had reached a certain stage, it was possible to keep records and transmit information to people who were not present when the information was given.
[C] With the development of civilization, primitive people who lived in caves at that time badly needed a language, which would help them to communicate with one another.
[D] The origin of language is also obscure. No doubt it began very gradually.
[E] In fact, there was progress--there were even two inventions of very great importance, namely, gunpowder and the mariner’s compass--but neither of these can be compared in their revolutionary power to such things as speech and writing and agriculture.
[F] These were, at first, only those in which nature fertilized the soil after each harvest. Agriculture met with violent resistance from the pastoral nomads, but the agricultural way of life prevailed in the end because of the physical comforts it provided.
[G] But industry was a step in human progress to which subsequently there was nothing comparable until our own machine age.