2012年12月大学英语六级考试精选题(7)_第2页

　　1. Which of the following best portrays the organization of the passage?
　　A. The author presents the advantages and disadvantages of plankton as a food source.
　　B. The author quotes public opinion to support the argument for farming plankton.
　　C. The author classifies the different food sources according to amount of carbohydrate.
　　D. The author makes a general statement about plankton as a food source and then moves to a specific example.
　　2. According to the passage, why is plankton regarded to be more valuable than land grasses?
　　A. It is easier to cultivate.
　　B. It produces more carbohydrates.
　　C. It does not require soil.
　　D. It is more palatable.
　　3. Why does the author mention “planktonburgers”?
　　A. To describe the appearance of one type of plankton. 考试网
　　B. To illustrate how much plankton a whale consumes.
　　C. To suggest plankton as a possible food sources.
　　D. To compare the food values of beef and plankton.
　　4. What is mentioned as one conspicuous feature of krill?
　　A. They are the smallest marine animals.
　　B. They are pink in color.
　　C. They are similar in size to lobsters.
　　D. They have grass like bodies.
　　5. The author mentions all of the following as reasons why plankton could be considered a human food source except that it is ___.
　　A. high in food value.
　　B. in abundant supply in the oceans.
　　C. an appropriate food for other animals.
　　D. free of chemicals and pollutants.
　　答案：DBCBD