题目

阅读理解 Pet owners, at least in the West, are more likely than other people to be vegans(素食主义者). That puts many of them in a difficult situation when it comes to feeding their pets like cats and dogs. But technology may soon sort it out. The idea of growing meat for human consumption, in the form of cell cultures, is now becoming popular. Some see in this approach a way to give pet owners peace of mind by offering different food. Among these forward thinkers are Shannon Falconer and Joshua Errett, the founders of Because Animals, a firm based in Philadelphia. They have taken the idea to what might be seen as its logical conclusion, for the starting point of their cultured cat food is a mouse. One of Because Animals'competitors, Wild Earth, of Berkeley, California, which had had similar thoughts about making cat food from cultured mouse cells, chose to withdraw after finding itself on the receiving end of aggressive responses based on the misunderstanding that the production process would involve killing mice. Wild Earth has now teamed up with other developers of cultured meat to investigate the possibilities of fish and chicken cells instead. It plans to launch products made by mixing these with its existing vegan pet food recipes. A third firm, Bond Pet Foods of Boulder, Colorado, is developing something one step yet further removed from conventional pet food. It, too, works with chickens. But instead of growing their cells directly, it is inserting genes for nutritionally important chicken proteins into cells of brewer's yeast (啤酒酵母). These reproduce faster than chicken cells do, and nurturing them is a well-understood art. Bond hopes to have dog food containing proteins from these cells on the market by 2023. As a consequence of their target market —devoted " pet parents" —all three firms hope to sell at good prices. Moreover, manufacturers of laboratory meat, whether intended for people or for pets, can claim green credentials (环保资质). Dr Falconer says that a kilogram of cultured meat produces just 1.7kg of carbon-dioxide emissions, compared with 27kg from the same quantity of beef. （1） What is Because Animals aiming to do? A . Produce guilt-free pet food. B . Turn family pets into vegans. C . Prevent humans abusing animals. D . Grow meat for human consumption. （2） What stopped Wild Earth culturing mouse cells? A . The unavailability of technology. B . The lack of cooperating companies. C . The killings involved in the process. D . The pressure from the general public. （3） In what way is Bond's pet food production special? A . It takes cells from chickens. B . It uses a fast-working approach. C . It contains different types of protein. D . It adds traditional food to brewer's yeast. （4） What does Dr Falconer stress about cultured meat? A . It's cost-effective. B . It's good-looking. C . It's eco-friendly. D . It's custom-made. 答案： A D B C

查看本题答案和解析