Ques: Read the following article and select the best answer. Article: The color red often means danger --- and by paying attention, accidents can be prevented. At railroad crossings, flashing red fights warn cars to stay back. A red light at a traffic crossing tells cars to stop, so they don't run into other cars. In the future, the color red also may help prevent 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 . 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. To get a rough picture of one way atoms are held together in a molecule, imagine you and your friends standing in a large circle, holding hands. Each person represents one atom, your clasped hands represent the bond, and the entire circle represents a molecule. The molecule being used to turn the material red is called mechanophore . When one chemical bond in the mechanophore molecule breaks, the rest of the molecule turns red. 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. This "self-healing" may be a problem for engineers who want to use the color-changer in big construction projects that will be outside, in the sunlight. And if bright light keeps the red color from appearing, then the mechanophore's warning system will be useless. Scientists still have a lot of work to do before the color-changing molecules can be used outside the lab. If mechanophore can be used in the real world, they are suggested to be employed in a new kind of paint. Question: The color red will be used at construction sites to _ . - tell different materials used in the building - warn people that the building is dangerous - make the building more beautiful - tell people the building is under construction
Ans: warn people that the building is dangerous

Ques: Read the following article and select the best answer. Article: In an ideal world,people would not test medicines on animals. Such experiments are stressful and sometimes painful for animals,and expensive and timeconsuming for people. Yet animal experimentation is still needed to help bridge vast gaps in medical knowledge. That is why there are some 50 to 100 million animals used in research around the world each year. Europe,on the whole,has the world's most restrictive laws on animal experiments. Even so,its scientists use some 12 million animals a year,most of them mice and rats,for medical research. Official statistics show that just 1.1 million animals are used in research in America each year. But that is misleading. The American authorities do not think mice and rats are worth counting and,as these are the most common laboratory animals,the true figure is much higher. Japan and China have even less comprehensive data than America. Now Europe is reforming the rules governing animal experiments by restricting the number of animals used in labs. Alternatives to animal testing,such as using human tissue or computer models,are now strongly recommended. In addition,sharing all research results freely should help to reduce the number of animals for scientific use. At present,scientists often share only the results of successful experiments. If their findings do not fit the hypothesis being tested,the work never sees the light of day. This practice means wasting time,money,and animals' lives in endlessly repeating the failed experiments. Animal experimentation has taught humanity a great deal and saved countless lives. It needs to continue,even if that means animals sometimes suffer. Europe's new measures should eventually both reduce the number of animals used in experiments and improve the way in which scientific research is conducted. Question: What usually happens to unsuccessful animal experiments? - They are not made known to the public. - They are made into teaching materials. - They are collected for future publication. - They are not removed from the research topic list.
Ans: They are not made known to the public.

Ques: Read the following article and select the best answer. Article: Throughout history, people have been interested in knowing how language first began, but no one knows exactly where or how this happened. However, we do know a lot about languages, the languages of today and also the languages of earlier times. There are probably about three thousand languages in the world today. Chinese is the language with the most speakers. English, Russian and Spanish are also spoken by many millions of people. On the other hand, some languages in the world have less than one hundred speakers. There are several important families of languages in the world. For example, most of the languages of Europe are in one large family called Indo-European. The original language of this family was spoken about 4,500 years ago. Many of the present day languages of Europe and India are modern forms of the language of 4,500 years ago. Languages are always changing. The English of today is very different from the English of 500 years ago. In time some even die out completely. About 1,000 years ago English was a little -known relative of German spoken on one of the borders of Europe. If a language has a lot of speakers or if it is very old, there may be differences in the way it is spoken in different areas. That is, the language may have several dialects. Chinese is a good example of dialect differences. Chinese has been spoken for thousands of years by many millions of speakers. The differences between the dialects of Chinese are so great that speakers of Chinese from some parts of China cannot understand speakers from other parts. Question: Many European and Indian languages _ . - will soon die out completely - were once a relative of English - are the same as before - come from the same family
Ans: come from the same family

Ques: Read the following article and select the best answer. Article: SHANGHAI--The Shanghai World Financial Centre will be the tallest land-mark in the world after its completion this century in Pudong, according to the project's Japanese investors. The building will be located in the prime Lujiazui Zone in Pudong , on a 30,000-square-metre site. The building was originally designed to be a 94-floor office tower with a height of 460 metres. The project broke ground in 1997 but was later halted as a result of the financial crisis in Southeast Asia. "As the economy warms up, we are more confident about Shanghai and the whole prefix = st1 /Chinaand we are working hard to get the Project restarted as soon as possible," said Katsuyuki Takeuchi, vice-president and general manager of the Shanghai World Financial Centre Company. Its parent company, Japan-based Moil Building Co. Ltd, established the Shanghaisubsidiary as the operator responsible for this ambitious project. The design, which is undergoing revision in apian, will accommodate international high-tech businesses, department stores, art galleries, clubs and a five-star hotel. Unlike the gloomy economies of theUnited States, Europe andJapan,Chinaenjoys a strong growth with brighter prospects, Takeuchi said. More capital and businesses are expected to flow into Shanghai, which aims to become a world centre for trade and the financial industry--with Lujiazui as its showpiece. The layout of Luijiazui includes three tall buildings, one of which is the completed JinmaoTower, each rising above 400 metres, as designed by local government after holding an international design competition early last decade. Other buildings nearby fall in height gradually, creating a special shape against the skyline. The Shanghai World Financial Centre will be built as the peak of the mountain. "The peak will be safe thanks to the perfect design, advanced technology and the stable social and political environment in Shanghai," Takeuchi said, reassuring those who might be anxious about the safety of the soon-to-be world's tallest building. Question: Why is the ShanghaiWorldFinancialCenterto be built? : - Because it is by the bank of the ChangjiangRiver. - Because it is going to be the highest building in China. - Because the economy of Chinais of a better future than of other countries. - Because the builders in Shanghaicould be sure of the quality of the building.
Ans:
Because the economy of Chinais of a better future than of other countries.