C. When a person is burnt, keep pressure on the burn until help arrives.
D. Not everyone can do first aid to save a life.
5. The passage mainly tells us ____.
A. how to learn first aid by yourself
B. some misunderstandings about first aid
C. the importance of first aid
D. how to help the medical team save a life
B
A paper shows that researchers in Japan have successfully grown fully-functioning mouse skin in a laboratory, from a set of reprogrammed cells. Researchers were able to grow the independent sections of mouse skin tissue thanks to an advance from nearly a decade ago, when researchers learned how to take young cells and reprogram them to grow into a different kind of cell. In this case, cells from mice were redirected to become skin cells.
Skin grafts(移植) are a big deal in the world of life-saving technology, as functioning skin is slow to create from grafts, leaving the body vulnerable(易受伤害的). Healthy skin produces vitamins, protects the body from infection, and regulates body temperatures. But current graft techniques don’t create a solution that can do that immediately. In fact, the “skin” grown in labs for grafting before isn’t nearly as complex as what you’ve already got on your body. In many cases it’s less like a full organ and more like a top layer, able to cover an exposed area until the rest of the body regenerates underneath.
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