首页
登录
职称英语
Chemistry plays an important part in our life. The【1】______ of a clock,
Chemistry plays an important part in our life. The【1】______ of a clock,
游客
2023-12-12
25
管理
问题
Chemistry plays an important part in our life. The【1】______ of a clock, 【1】______
the clothes we wear, and our leather shoes are all made【2】______. 【2】______
the water we drink is chemically purified. The glass and【3】______ of the mirror,【3】______
the manufacturing of light bulbs, the paint and plaster on our walls require chemistry. The cooking, digestion and assimilation of the food are all chemical【4】______ 【4】______
The construction of an automobile may require
many kinds of chemically made【5】______. 【5】______
Chemistry and its【6】______ have helped us to live longer. 【6】______
The science of medicine also【7】______ heavily upon chemistry. 【7】______
And with【8】______ and antiseptics, surgery is no longer crude and limited. 【8】______
Our increasing knowledge of the chemical【9】______ that take place in the human body results in great strides in modern medicine. 【9】______
Fortunately, most of us do not need a profound knowledge of chemistry, but some understanding of chemistry should be a part of the【10】______ of every educated person. 【10】______ [br] 【1】
Chemistry deals with the materials of which the world is composed and the changes they many undergo. All of us, whether we are farmers, merchants, doctors, mechanics, chemists, housewives, or students, use this science directly or indirectly in a thousand ways every day. Our lives are made longer, healthier, richer, more convenient, and more pleasant because of chemistry.
We need only consider our daily routine activities to appreciate the part chemistry plays in everyday life. The clock that wakes us in the morning probably has in its mechanism half a dozen different metals or alloys, all of which were prepared by chemical processes. The clothes we put on were bleached and dyed chemically, or perhaps woven from synthetic materials produced by chemical processes devised by man. The leather in our shoes was tanned and dyed with chemicals. The water with which we wash is chemically treated to purify, and, sometimes, to soften it. The soap, toothpaste, shaving cream or cosmetics we use are all chemical products. Chemistry is involved in the glass and silvering of the mirror, in the manufacture of light bulbs, and the paint and plaster on our wills. The food for breakfast is cooked, digested, and assimilated in our bodies by chemical processes. We drive to work or school in and automobile which may be constructed of a hundred different kinds of steel, to say nothing of the other metals and alloys, plastics, rubber, and fuels and lubricants which power or protect it. All of these were prepared by chemical processes.
The science of medicine draws heavily upon chemistry, and many of us are alive today because of chemical products. Evidence indicates that, in ancient Rome, life expectancy averaged 22 years. Yet, in 1912 life expectancy in the United States averaged about 49 years. Now it has reached 70 for men and 73 for women. Chemistry and its products have played an important part in this increase in the life span of man.
Modem surgery is dependent upon anesthetics and antiseptics. Ether was first used as an anesthetic by Long in 1842. Chloroform was used a few years later. Before that time the patient might have been given opium derivatives or whiskey, or he might simply have been held down. Surgery was necessarily very crude and limited. Semmelweis in 1847 discovered that the hands, instruments, and clothing of the doctor could carry infection, and demanded that doctors maintain higher standards of cleanliness. In 1877 in Germany, Koch proved that germs caused disease or infection, and that they could often be controlled by chemicals. Pasteur’s work on the destruction of bacteria in food was done in the early 1860s.
The sulfa drugs developed in the 1930s proved to be powerful weapons against disease, and a little later the antibiotics were an even more important breakthrough in the fight against germs. Epidemics of typhus, cholera, diphtheria, and smallpox, which once swept the land, bringing death or disfiguration, are virtually a thing of the past now in most of the world. Chemistry has played a mighty part in their defeat. The great strides being made in modem medicine are largely the result of an increasing knowledge of the chemical reactions that take place in the most complex of all chemical systems, the human body. Fortunately, most of us do not need a profound knowledge of chemistry in order to use the chemical processes and chemical products of modem living. Some understanding of the principles, processes, and applications of chemistry, nevertheless, should be a part of the background of every educated person.
选项
答案
mechanism
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3266700.html
相关试题推荐
ItisgenerallyregardedthatKeats’mostimportantandmaturepoemsareinthe
ThemostimportantsociologicaluseoflanguageisA、informativefunction.B、inte
SteveandYaserfirstmetintheirchemistryclassofanAmericanuniversity
SteveandYaserfirstmetintheirchemistryclassofanAmericanuniversity
SteveandYaserfirstmetintheirchemistryclassofanAmericanuniversity
SteveandYaserfirstmetintheirchemistryclassofanAmericanuniversity
SteveandYaserfirstmetintheirchemistryclassofanAmericanuniversity
Intheschoolsofancienttimes,themostimportantexaminationswerespoken
Intheschoolsofancienttimes,themostimportantexaminationswerespoken
Intheschoolsofancienttimes,themostimportantexaminationswerespoken
随机试题
Wal-MartA)Wal-Martismorethanjusttheworld’
用木瓜蛋白酶将IgG分子水解为()A.2个Fab片段和Fc段 B. C.
尾矿库安全度主要根据尾矿库防洪能力和尾矿坝坝体稳定性确定,分为()。A.危库、正
A.质量为2m的滑块受到重力、绳的张力、沿斜面的下滑力和斜面的支持力的作用 B
香溪河上的宝坪村,是王昭君的故乡,这个看着并不起眼的________却孕育了一代
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性: A.如
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
下列哪一行为不违反《土地管理法》的规定?A.某军队转让以政府划拨方式获得的土地使
计算某年的婴儿死亡率,其分母是A.年初0岁组人口数 B.年末0岁组人口数 C
低钾血症时,最早出现的临床表现是A.心电图改变 B.肌乏力 C.口苦、恶心
最新回复
(
0
)