【听力原文】
[3] Professor Post is developing a way to grow meat in a lab because he believes that livestock farming is not good for the environment,not good for animals nor，he says，is it going to satisfy the growing demand for meal.
His aim is to produce a burger that looks and tastes just like the real thing，but from what I saw at his lab，is still a work in progress．[4]The flesh，grown from stem cells，is pale white and tasteless，so food technologists have had to mix in some ingredients to add flavor and vegetable juice to add color．The mixture is then put together to make the burger that will be cooked then eaten by two food writers．
Initial testing during the development process suggests that it won ’t taste great，but according to Professor Post，it will taste good enough．
Why is Professor Post developing a way to grow meat in a lab?
【做题提示】在听到why的时候应该回忆新闻中提到 “because”部分的内容。
【解析】在实验室内生产人造肉的原因在新闻开头处。A选项中出现能源一词，原文中并没有出现。c选项中出现的空气，原文中也没有出现。D选项中的成本问题亦没有涉及，故选B，原文中有详细说明。