Animal experts in Vietnam are using eDNA to find the last, wild Yangtze giant softshell turtles. One researcher on the Caribbean island of Trinidad is using the sampling technology to find endangered golden treefrogs. And in Madagascar, it is being used to identify amphibian diseases.

　　Ms. Goldberg has used eDNA testing to confirm the local extinction, disappearance, of a leopard frog in the American state of Idaho. She has also been asked to document the spread of the New Zealand mudsnail(泥螺) in the state of Washington.

　　Now, the U.S. Bureau of Land Management wants Caren Goldberg to look for the Columbia spotted frog in two other western states. The rare amphibian is a candidate for the federal government’s threatened species list.

　　Scientists working with the technology say they do not expect robots to replace field biologists anytime soon. But the old-fashioned field work could soon be more targeted.

　　1. Environmental DNA can be used to ____.

　　A. help explore the new world

　　B. save the endangered species

　　C. write the science fiction stories

　　D. identify the creatures that live in a certain place

　　2. Why is DNA testing more widely available now?

　　A. Because the samples are easy to find.

　　B. Because it costs less money than before.

　　C. Because it is considered the most effective way.

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