2020年职称英语考试《理工类》考试共65题，分为单选题和多选题和判断题和计算题和简答题和不定项。小编每天为您准备了5道每日一练题目（附答案解析），一步一步陪你备考，每一次练习的成功，都会淋漓尽致的反映在分数上。一起加油前行。

1、English and English Community1 There is no doubt that English is a useful language. The people who speak English today make up the largest speech community in the world with the exception of speakers of Chinese. 2 A speech community is similar to other kinds of communities. The people who make up the community share a common language. Often they live side by side, as they do in a neighborhood, a village, or a city. More often they form a whole country. National boundaries, however, are not always the same as the boundaries of a speech community. A speech community is any group of people who speak the same language no matter where they happen to live. 3 We may say that anyone who speaks English belongs to the English speech community. For convenience, we may divide the speakers into two groups: one in which the speakers use English as their native language, the other in which the speakers learn English as a second language for the purpose of education, commerce, and so on. 4 Learning a second language extends one\'s vision and expands the mind. The history and literature of a second language record the real and fictional lives of people and their culture; a knowledge of them adds to our ability to understand and to feel as they feel. Learning English as asecond language provides another means of communication through which the window of the entire English speech community becomes a part of our heritage. Many people learn English as____. 【单选题】

A.a second language

B.the same language

C.the same speech community

D.any other language

E.national boundaries

F.a part ofone\'s heritage

正确答案:A

答案解析:从文章第2段可以推断，许多人将英语作为第二语言来学。

2、The love of money is the root of all evil.【单选题】

A.result

B.end

C.cause

D.force

正确答案:C

答案解析:贪财是万恶之源。本题有一定难度，干扰项的干扰较强，A项的干扰很大，有好多考生选了A，result指“结果”，题干里root指“根源”，选项里只有cause“原因”是其近义解释，是最佳答案。

3、Black HolesMost scientists agree that black holes exist but are nearly impossible to locate. A black hole in the universe is not a solid object, like a planet, but it is shaped like a sphere (球体). Astronomers (天文学家) think that at the center of a black hole there is a single point in space with infinite (无限的) density (稠密).This single point is called a singularity (奇点). If the singularity theory is correct, it means that when a massive star collapses, all the material in it disappears into the singularity. The center of a black hole would not really be a hole at all, but an infinitely dense point. Anything that crosses the black hole is pulled in by its great gravity.Although black holes do exist, they are difficult to observe. These are the reasons,?No light or anything else comes out of black holes. As a result, they are invisible to a telescope.?In astronomical terms, black holes are truly. For example, a black hole formed by the collapse of a giant star would have an event horizon (视界) only 18 miles across.?The nearest black holes would be dozens of light years away from Earth. One light year is about 6 trillion (万亿) miles. Even the most powerful telescopes could not pick out an object so small at such a great distance.In 1994 the Hubble Space Telescope provided evidence that black holes exist. There are still answers to be found, however, so black holes remain one of the mysteries of the universe. (2007年)Black holes exist but are difficult to observe.【单选题】

A.Right

B.Wrong

C.Not mentioned

正确答案:A

答案解析:题干大意：黑洞是存在的，但是很难观察到。题干中的关键词为difficult，用它回到原文定位，在首句能找到difficult的近义词impossible。文章首句提到：Most scientists agree that black holes exist but are nearly impossible to locate. 黑洞确实存在，但很难定位(locate)，与题意信息相符，故答案选A。

4、Have you talked to her lately?【单选题】

A.lastly

B.finally

C.shortly

D.recently

正确答案:D

答案解析:题干大意：最近你跟她谈话了吗？画线词：lately：近来，选项中，recently：最近。lastly：最后，终于。如：Lastly, we have aggregated these laws of de mand and supply. 最后，我们把需求与供给的定律综合起来。finally：最终。如：He finally agreed to my plan. 最后他同意了我的计划。shortly：立刻。如：About 30 emergency workers died of radiation exposure shortly after the accident. 大约30个抢险工人在事故后不久死于放射线照射。

5、Seeing Red Means Danger AheadThe color red often means danger and by paying attention, accidents can be prevented. In the future, the color red also may help _____ danger at construction sites. Thanks to new work by engineers, bridge supports or other kinds of materials, could one day contain a color - changing material. It will turn red before a structure collapses or falls apart.The secret behind the color - changing material is a particular type of molecule (分子). A molecule is a group of atoms (原子) held together by chemical bonds. Molecules come in all shapes and sizes and make up everything you can see, touch or feel. How a molecule behaves depends on what kinds of atoms it contains and how they\'re held together.When a polymer (聚合物) containing a color - changing molecule called a mechanophore (机械响应性聚合物) is about to break, it produces a color. When a polymer with mechanophore molecules becomes "injured" or weak, one of the mechanophore bonds breaks and the material turns red. "It\'s a really simple detection method," says Nancy Sottos, one of the scientists who worked on the project. Sottos and her team tested the color - changing polymers in their lab. The test results proved encouraging.There is a way to get rid of the red color light. When a bright light is shone on the mechanophore, the broken bond is fixed and the red color disappears. Thus "self - healing" may be a problem for engineers. They need to use the color - changer in big construction projects that will be outside, under sunlight. And sunlight will make the mechanophore\'s warning system useless.Sottos and her fellow scientists still have a lot of work to do before the color - changing molecules can be used outside the lab.【单选题】

A.throw

B.prevent

C.create

D.keep

正确答案:B

答案解析:本题难度不大，考查的是动词的词义辨析，干扰项干扰不大，此处是说，“在未来，红色可以帮助建筑场所阻止危险的发生”，答案是B。