题目

阅读理解 Scientists based in Japan's Osakn University have found a way to3 D printed wagyu(和牛)beef in a lab--a step they believe will one day help make widely available and sustainably-produced cuts of cultured meat that closely resemble original products. Using stem cells that they took from wagyu cows, the scientists set out to create a structure with the characteristic marbling seen in wagyu beef that sets it apart from other cuts of beef. By isolating beef cells, the scientists organized the muscles, blood vessels, and fat. The researchers then shaped these tissues into the form of a steak by using a technique called 3D bioprinting, where cell structures can be layered(分层)to resemble real tissues in living things. Wagyu beef is known to be extremely expensive, with wagyu selling for up to $200 per pound and adult cows selling for more than S30, 000. In 2019, Japan's wagyu exports reached a record high of $268. 8 million in profits, up 20% from 2018. This might be the first cut of wagyu beef ever to be 3D-printed. The researchers believe that proving that a wagyu beef can be accurately 3D-printed could be a big step toward a sustainable future where cultured meat can be created that closely resembles existing products. 3D printed wagyu beef originates from real meat and is also different from plant-based options. "By improving this technology, it will be possible to not only reproduce complex meat structures, such as the beautiful marbling of wagyu beef but to also make small adjustments to the fat and muscle components, " Michiya Matsusaki, one of the project's researchers, said in a statement. Michiya Matsusaki added that with these adjustments, customers might one day be able to order a cultured cut of meat with the amount of fat they desire, tailor-made to their tastes and health concerns. However, it might be a while before one can sink their teeth into a cut of bioprinted beef. The United States Department of Agriculture (USDA)and the Food and Drug Administration (FDA)have not created a regulatory framework for these products yet, according to The Washington Post. （1） What is paragraph 2 mainly about? A . The characteristics of wagyu beef. B . The process of 3D printing wagyu beef. C . The advantages of 3D bioprinting technique. D . The difficulties of taking cells from wagyu cows. （2） Why does the author list numbers in paragraph 3? A . To explain the effect of export trade on Japan. B . To stress the high costs of raising cows in Japan. C . To prove the huge investment in 3D printed products. D . To show the potential value of 3D printed wagyu beef. （3） What does "cultured meat" refer to? A . Processed meat B . Plant-based meat C . Man-made meat D . Real meat （4） What can be a suitable title for the passage? A . The first cut of 3D printed wagyu beef B . The future of 3D printed wagyu beef C . Let's make our own 3D wagyu beef D . Traditional Wagyu beef or 3D printed wagyu beef 答案： B D C A

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