【正确答案】 B

【答案解析】原文：American scientists say they have developed a way to grow wood material in a laboratory. The method could create different wood products indoors in a single process, greatly cutting the cost of production and reducing damage to the world’ s forests. Researchers from the Massachusetts Institute of Technology demonstrated a proof of concept by growing wood-like structures from cells taken from the leaves of a flowering plant. The results were recently reported in a study appearing in the Journal of Cleaner Production.题目问的是新闻中报道的研究结果是什么。新闻提到，美国科学家说，他们已经开发出了一种在实验室里种植木材的方法。这种方法可以在室内一次性生产不同的木制品，大大降低生产成本，减少对世界森林的破坏。这就是在一项研究中被报道出来的结果。故答案为B。