题目

 阅读理解Scientists have come up with a new way of identifying animals in an area by testing DNA taken in from the air. The researchers believe their new method could help scientists keep track of animals that are hard to spot, including endangered animals.Two teams of scientists—one in Denmark and one in the United Kingdom (UK)—came up with the same question at about the same time: Could they identify the animals in an area from DNA that was simply floating in the air?Testing for eDNA isn't a new idea, but most of the time, scientists look for eDNA in water. DNA in the air is usually so small that it would take a microscope to see it. The scientists didn't have high hopes for their experiment. Neither team knew that the other group was working on a similar experiment. One collected samples from different locations at Denmark's Copenhagen Zoo, and the other at Hamerton Zoo Park in the UK. The scientists used slightly different methods to collect their samples. But basically, both teams collected extremely tiny bits of DNA onto very high quality filters.In the laboratory, they got the DNA from the filters and made copies of it to study. By comparing their samples with examples of DNA from different animals, the scientists were able to identify many different animals at the zoos.Each team only discovered about the other experiment after they had written a paper about their own results. Instead of competing, the two decided to combine their results and publish a paper together.Both teams are excited about the ways this new method could be used in the wild. Scientists have been looking for better ways to track endangered animals without interfering with them. If researchers know where animals live, they can do a better job of protecting them. "The next step is to figure out how to take this method into nature," says Dr. Bohmann, one of the scientists on the Copenhagen team. （1） What's the task of the scientists from different countries? A . To recognize animals by DNA in the open air. B . To improve what the other team have achieved. C . To look for eDNA in water for some rare animals. D . To save endangered animals by copying their DNA. （2） What can we know from paragraph 3? A . The two teams collected DNA from the same zoo. B . Neither team made correct treatment on the study. C . The two teams used completely different techniques. D . Scientists didn't think highly of the two teams' methods. （3） Which of the following can best describe the two teams' cooperation? A . Eventful. B . Competitive. C . Promising. D . Complicated. （4） What is the text mainly about? A . People's efforts in saving endangered animals. B . New methods of recognizing animals by DNA. C . Ways of studying animals without disturbing them. D . Different countries' cooperation in saving animals. 答案： A D C B

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