2022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、Seeing Red Means Danger AheadThe colｏｒred often means danger ａｎｄ　by paying attention, accidents can be prevented. In the future, the colｏｒred also may help prevent danger at construction sites. Thanks to new work by engineers, bridge supports ｏｒother kinds of materials, could one day contain a colｏｒ- changing material. It will turn red before a structure collapses ｏｒfalls apart.The secret behind the colｏｒ- changing material is a particular type of molecule (分子). A molecule is aｇｒｏｕｐof atoms (原子) held together by chemical bonds. Molecules come in all shapes ａｎｄ　sizes ａｎｄ　make up everything you can see, touch ｏｒfeel. 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" ｏｒweak, 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 colｏｒlight. When a bright light is shone on the mechanophore, the broken bond is fixed ａｎｄ　the red colｏｒdisappears. Thus "self - healing" may be a problem fｏｒengineers. 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 _____.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.dangerous

B.useless

C.helpful

D.important

正确答案:B

答案解析:本题有一定难度，干扰项干扰较大，关键在理解好文章上下文意义，文章此处是说“阳光会让这种机械响应性聚合物的报警系统失效”，答案是B。

2、Cell Phone Lets Your Secret OutYour cell phone holds secrets about you. Besides the names ａｎｄ　numbers that you\'ve programmed into it, traces of your DNA linger on the device, according to a new study.DNA is genetic material that appears in every cell. Like your fingerprint, your DNA is unique to you- because you have an identical twin. Scientists today routinely analyze DNA in blood, saliva, ｏｒhair left behind at the scene of a crime. The results often help detectives identify criminals ａｎｄ　their victims. Your cell phone can reveal more about you than you might think.Meghan J. McFadden, a scientist at McMaster University in Hamilton, Ontario, heard about a crime in which the suspect bled onto a cell phone ａｎｄ　later dropped the device. This made her wonder whether traces of DNA lingered on cell phones even when no blood was involved. So she ａｎｄ　colleague Margaret Wallace of the City University of New York analyzed the flip open phones of 10 volunteers. They used swabs to collect invisible traces of the users from two parts of the phone: the outside, where the user holds it, ａｎｄ　the ______, which is placed at the user\'s ear.The scientists scrubbed the phones using a solution made mostly of alcohol. The aim of washing was to remove all detectable traces of DNA. The owners got their phones back fｏｒanother week. Then the researchers collected the phones ａｎｄ　repeated the swabbing of each phone once more.The scientists discovered DNA that belonged to the phone\'s speaker on each of the phones. Better samples were collected from the outside of each phone, those swabs also picked up DNA that belonged to other people who had apparently also handled the phone. Surprisingly, DNA showed up even in swabs that were taken immediately after the phones were scrubbed. That suggests that washing won\'t remove all traces of evidence from a criminal\'s device. So cell phones can now be added to the list of clues that can clinch a crime scene investigation.【单选题】

A.card

B.keys

C.screen

D.speaker

正确答案:D

答案解析:研究者从手机的两部分收集手机微量DNA：一是手机外壳，二是喇叭。贴在耳朵上的不可能是card、screen和keys。

3、Rockets in the SkyIf someone asked you. "What colｏｒis the sky?" I expect that you would answer, "Blue." I am afraid that you would be wrong. The sky has no color. When we see blue, we are looking at blue sunlight. The sunlight is shining on little bits of dust in the air. We know that there is air all around the world. We could not breathe without air. Airplanes could not fly without air. They need air to lift their wings. Airplanes cannot fly very high because as they go higher the air gets thinner. If we go far enough away from the earth, we find there is no air. What is the sky? The sky is space. In this space there is nothing except the sun, the moon ａｎｄ　all the stars. Scientists have always wanted to know more about the other worlds in the space. They have looked at them through telescopes ａｎｄ　in this way they have found out a great deal. The moon is about 384,000 kilometers away from the earth. An airplane cannot fly to the moon but there is a thing that can fly even when there is no air. This is rocket. I am sure that you are asking. "How does a rocket fly?" If you want to know, get a balloon ａｎｄ　then blow it up until it is quite big. Do not tie up the neck of the balloon. Let go! The balloon will fly off through the air very quickly. The air inside the balloon tries to get out. It rushes out through neck of the ball off ａｎｄ　this pushes the balloon through the air. It does not need wings like an air plane. This is how a rocket works. It is not made of rubber like a balloon, of course. It is made of metal. The metal must not be heavy but it must be very strong. There is gas inside the rocket which is made very hot. When it rushes out of the end of the rocket, the rocket is pushed up into the air. Rockets can fly far out into space. Rockets with men inside them have already reached the moon. Several rockets, without men inside them, have been sent to other worlds much farther away. One day rockets may be able to go anywhere in the space. A rocket is pushed up into the air when____. 【单选题】

A.hot gas rushes out of its head.

B.it is powered by gas.

C.hot gas rushes out of its bottom.

D.hot gas rushes out of its neck.

正确答案:C

答案解析:根据文章倒数第2段最后一句( When it rushes out of the end of the rocket)。

4、The SmogFｏｒover a month, Indonesia was in crisis. Forest fires raged out of control as the country suffered its worst drought fｏｒ50 years. Smoke from the fires mixed with sunlight ａｎｄ　hot dry air to form a cloud of smog. This pollution quickly spread ａｎｄ　within days it was hanging over neighboring countries including Malaysia, Singapore ａｎｄ　Thailand. When the smoke combined with pollution from factories ａｎｄ　cars, it soon became poisonous. Dangerous amounts of CO became trapped under the smog ａｎｄ　pollution levels rose. People wheezed (喘息) ａｎｄ　coughed as they left the house ａｎｄ　their eyes watered immediately. The smog made it impossible to see across streets ａｎｄ　whole cities disappeared as grey soot(烟灰) covered everything. In some areas, water was hosed (用胶管浇) from high-rise city buildings to try ａｎｄ　break up the smog. Finally, heavy rains, which came in November. Put out the fires ａｎｄ　clear the air. But the environmental costs ａｎｄ　health problems will remain. Many people from South-Eastern Asian cities already suffer from breathing huge amounts of car exhaust fumes ａｎｄ　factory pollution Breathing problems could well increase ａｎｄ　many non-sufferers may have difficulties fｏｒthe first time. Wildlife has suffered too. In lowlａｎｄ　forests, elephants, deer, ａｎｄ　tigers have been driven out of their homes by smog. But smog is not just an Asian problem. In fact. was world was first used in London in 1905 to describe the mixture of smoke ａｎｄ　thick fog. Fog often hung over the capital. Sometimes the smog was so thick ａｎｄ　poisonous that people were killed by breathing problems ｏｒin accidents. About 4, 000 Londoners died within five days as a result of thick smog in 1952. The smog spread to neighboring countries. 【单选题】

A.Right

B.Wrong

C.Not mentioned

正确答案:A

答案解析:题句的意思是“烟雾飞散到临近国家”。与第1段第3句意思相同，故选A。

5、He purchased this stamp at an auction. 【单选题】

A.bought

B.showed

C.took

D.made

正确答案:A

答案解析:purchase等于buy，表示“买”；show：展现，表演；take：拿走；make:制作。