职称英语考试《理工类》每日一练精选及答案052840.docx

1、职称英语考试理工类每日一练精选及答案052840职称英语考试理工类每日一练精选及答案0528-401、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 prevent danger at construction sites. Thanks to new work by engineers, bridge supports or o

2、ther kinds of materials, could one day contain a color - changing material. It will turn red before a structure collapses or falls apart.The secret _ 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 co

3、me 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 theyre 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 c

4、olor. When a polymer with mechanophore molecules becomes injured or weak, one of the mechanophore bonds breaks and the material turns red. Its 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 polymer

5、s 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 b

6、ig construction projects that will be outside, under sunlight. And sunlight will make the mechanophores 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.onB.behindC.underD.down正确答案:B答案解析:本题

7、有一定难度，干扰项干扰较大，考查介词behind的用法，文章此处是说，“材料颜色可以变化其背后的秘密是”，只有behind可以表示“背后的”意思，答案是B。2、Animals Sixth SenseA tsunami was triggered by an earthquake in the Indian Ocean in December, 2004. It killed tens of thousands of people in Asia and East Africa, Wild animals, however, seem to have escaped that terrible

8、tsunami. This phenomenon adds weight to notions that they possess a sixth sense for disasters, experts said.Sri Lankan Wildlife officials have said the giant waves that killed over 24,000 people along the Indian Ocean islands coast clearly missed wild beasts, with no dead animals found.No elephants

9、are dead, not even a dead rabbit. I think animals can sense disaster. They have a sixth sense. They know when things are happening H. D. Ratnayake, deputy director of Sri Lankas Wildlife Department, said about one month after the tsunami attack. The waves washed floodwaters up to 2 miles inland at Y

10、ala National Park in the ravaged southeast, Sri Lankas biggest wildlife reserve and home to hundreds of wild elephants and several leopards.There has been a lot of scientific evidence about dogs barking or birds migrating before volcanic eruptions or earthquakes. But it has not been proven, said Mat

11、thew van Lierop, an animal behavior assistant at Johannesburg Zoo. There have been no _ studies because you cant really test it in a lab or field setting, he told Reuters. Other authorities concurred with this assessmetn.Wildlife seem to be able to pick up certain phenmenon, especially birds. There

12、are many reports of birds detecting impending disasters, said Clive Walker, who has written several books on African wildlife.Animals certainly rely on the known senses such as smell or hearing to avoid danger such as predators. The notion of an animal sixth sense -or some other mythical power-is an

13、 enduring one which the evidence on Sri Lankas ravaged coast is likely to add to. The Romans saw owls as omens of impending disaster and many ancient cultures viewed elephants as sacred animals endowed with special powers or attributes.【单选题】A.additionalB.specificC.especialD.exceptional正确答案:B答案解析:本段的

14、第一句是说明为什么这些迹象(evidence)没有得到科学验证。原因是科学家无法在实验室或野外进行特定的实验，以验证动物预见灾难的第六感觉。理解了上下文的意思，就知道选specific是最合适的。其他的三个选项的词义与上下文不符合，additional，especial和exceptional分别是“额外的”、“特别的”和“例外的”的意思。3、The chairman proposed that we stop the meeting.【单选题】A.statedB.announcedC.demandedD.suggested正确答案:D答案解析:主席建议我们中止会议。本题难度不大，考查的是基本

15、意义，干扰项干扰不大。propose和suggest都有“建议”的意思，是近义词，A项指“陈述”，B项指“宣布”，C项指“要求”和答案意义差异大，最佳答案是D。4、Singing Alarms Could Save the BlindIf you cannot see, you may not be able to find your way out of a burning building and that could be fatal. A company in Leeds could change all that with directional sound alarms capab

16、le of guiding you to the exit. Sound Alert, a company run by the University of Leeds, is installing the alarms in a residential home for blind people in Sommerset and a resource centre for the blind in Columbia. The alarms produce a wide range of frequencies that enable the brain to determine where the sound is coming from. Deborah Withington of Sound Alert says that the alar