A. It has great medical value.
B. It’s expensive to make it.
C. It will bring great profit.
D. It’s an independent section of the body.
4. It can be known from the passage that ____.
A. the new skin has already been widely used on humans
B. the new skin is too complex to be made
C. it is not long for scientists to develop the new skin
D. scientists have to do more research on the new skin
C
Many science fiction stories tell about explorers arriving in a new world. The explorers then use some kind of high-tech device(设备) to test for breathable air or signs of life. But here on Earth, science fiction is becoming a reality through a new sampling technology called environmental DNA(eDNA).
Ryan Kelly, an ecologist, works in a laboratory with other researchers studying the genetic material released by living creatures. “Essentially we can take a sample of soil or air or water, and we can sequence(按顺序排好) the DNA out of it and tell you what is there.” Ryan Kelly says they are studying water samples collected from Puget Sound. He says the cost of gene sequencing has dropped in recent years. That makes DNA testing more widely available.
Caren Goldberg heads the new eDNA lab at Washington State University. She is one of the first biologists to take the technology from the testing phase to actually using it. “It is extremely useful for species that are really hard to find. I have spent many hours looking for species that I was pretty sure were there — looking under rocks, looking in water, doing all kinds of surveys.” Caren Goldberg sees eDNA as a way to get answers more efficiently, safely and with less destruction compared to traditional survey techniques.
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