题目

It is reported that tea has helped the poor farmers in Yunnan find a way out of poverty（贫穷） thanks to the efforts of a man named Ren Huaican.Ren was suffering mouth ulcers （溃疡） when he first visited the Jingmai Mountain in Pu'er City in the spring of 2006. However, after picking off several leaves from the old tea trees and chewing （咀嚼） them, he found the pain was gone the next morning. He felt very amazed. Ren began to show great interest in the tea from Yunnan. He found that the local tea business was very scattered （分散的）.He also realized that the local tea 下列说法中正确的是（　　）A．宇宙的大小是有限的B．分子是物质结构中不可再分割的组成部分C．宇宙的直径大约是十万光年D．分子是保持物质化学性质的微小粒子