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truong5817
2 năm trước
What is the author's purpose in this passage?
A. To urge biologists to solve the problem of surplus human population
B.To conduct a survey of the biologist's role in society C. 
C.To advise biologists to carry out extensive research into genetic engineering
D.To emphasize the biologist's role in solving the world's problems
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Các câu hỏi liên quan

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 17 to 24.
The Rainforest Foundation UK
            The Rainforest Foundation is a charity in the UK. It campaigns for the preservation of the world’s rainforests and the rights of the people who live there. There are other Rainforest Foundations in the USA and Norway.
            The musician Sting and his wife set up the charity in 1989 after they saw the unacceptable destruction of the Amazon rainforest. Some farmers were wiping out large parts of the forest, which is the home of indigenous people. The Rainforest Foundation thinks that indigenous people are very important to the rainforests, and the charity is going to carry on its work with them in the future.
            The Rainforest Foundation has grown over the last twenty years and it now supports projects in different countries including Brazil, Peru, Cameroon and Uganda. Since it first started, the charity has helped local people to protect and save more than 100,000 square kilometers of the rainforest in a number of countries.
            Every year, supporters of the charity join in a number of big events to collect money. This year, they're going to run the London Marathon again. If you look at The Rainforest Foundation webpage, you'll find information about their latest events and campaigns. You can also sign up for an email newsletter.
In the past twenty years the charity has become _____.
A.more expensive        
B.a foundation              
C.bigger                 
D.smaller

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 26 to 32.
An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, or materials adversely. Air pollution requires a very flexible definition that permits continuous change. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelt - a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapour might be considered an air pollutant under certain conditions.
Many of the more important air pollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature. As the Earth developed, the concentration of these pollutants was altered by various chemical reactions; they became components in biogeochemical cycles. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil. On a global basis, nature's output of these compounds dwarfs that resulting from human activities. However, human production usually occurs in a localized area, such as a city. In such a region, human output may be dominant and may temporarily overload the natural purification scheme of the cycles. The result is an increased concentration of noxious chemicals in the air.
The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact, the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0.08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however, has a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm.
According to the passage, the numerical value of the concentration level of a substance is only useful if.......
A.the other substances in the area are known  
B.it is in a localized area
C.the natural level is also known      
D.it can be calculated quickly

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