《2025年学霸甘肃少年儿童出版社八年级英语下册人教版》

Ⅲ. 研究方法 来自月光大学生命科学院的学生 Mary 介绍了科学家研究的一个新办法：通过空气中的 DNA 来识别动物，并以此来帮助保护濒危动物，让我们一起来了解一下吧！
A key part of protecting endangered animals is trying to know where they're living. Using environmental DNA，or eDNA，to track(跟踪) animals isn't new. For a few years now，researchers have been using DNA in water.
Two teams of scientists—one in Denmark led by Dr. Kristine Bohmann and one in the UK led by Dr. Elizabeth Clare came up with the same question at about the same time：Could they identify（辨别）the animals from DNA that was floating(飘) in the air? DNA in the air is usually so small that it would take a microscope(显微镜) to see it. “I thought the chances of collecting animal DNA from air would be small though much time had been spent on it，but we moved on，” said Bohmann.
One team collected samples(样本) from different locations at Denmark's Copenhagen Zoo，and the other at Hamerton Zoo Park in the UK. Clearly，they both chose the zoos. In fact，both the zoos were almost like the zoos that were custom - built for the experiments：The animals in the zoos were non - native，so it is easy to identify them in DNA analyses(分析). What's more，the scientists know exactly where they are from. In the laboratory，by comparing their samples with examples of DNA from different animals，the scientists succeeded in identifying many different animals in the zoos.
Neither team knew that the other team was working on a similar experiment. When they discovered about the other experiment，rather than compete to rush out a publication(出版物) first，they got in touch and decided to publish their findings as a pair. “We both thought the papers are stronger together，” says Clare.
“The next step is to take this method into nature to track animals that are hard to find，including endangered animals，” says Bohmann.
1. What did Bohmann think of the experiment at the beginning?
A. It could be a failure.
B. It wouldn't take long.
C. It would cost much.
D. It could be crazy.
2. Why did the scientists look for animal DNA in the zoos?
A. They raised many rare animals there.
B. They specially built the zoo for the experiment.
C. They could collect enough animal D
D. They could tell the animals' kinds and locations easily.
3. Which of the following is TRUE?
A. The two teams came up with DNA in water at about the same time.
B. One of the teams failed to collect the samples in the zoo.
C. The teams competed to rush out a publication first.
D. Their findings can help protect the endangered animals.
4. What is the best title for the passage?
A. Research teams test DNA in nature
B. DNA in the air helps identify animals
C. Different zoos organize DNA studies
D. Scientists work hard to protect animals

答案： A
@@D
@@D
@@B