题目

阅读理解 Inspired by a 9-year-old cyclist, Lauren Turner, who canonly use one hand, a group of University of Guelph students has won an internationalaward for their invention－a bike brake lever (刹车手柄) that pulls both the front brake andthe back brake at the same time. Lauren Tuner was able to ride her bike, but not asconfidently and quickly as her friends. “She couldn't use the front brake. She only used the backbrake, but the front brake makes you stop twice as fast,” says Micha Wallace,who, with Katie Bell, Anina Sakaguchi and Andrew Morries won second prize inthe James Dys 在叶绿体的色素提取和分离实验中，实验结果表明，在滤纸条上相邻色素带之间距离最小的是 [　　] A．叶绿素a和叶绿素b B．叶绿素a和叶黄素 C．叶黄素和胡萝卜素 D．无法判断