题目

Inspired by a 9-year-old cyclist, Lauren Turner, who can only use one hand, a group of University of Guelph students has won an international award for their invention — a bike brake lever (刹车手柄) that pulls both the front brake and the back brake at the same time.Lauren Tuner was able to ride her bike, but not as confidently and quickly as her friends.“She couldn’t use the front brake. She only used the back brake, 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 in the James Dyson A20．有理数a、b在数轴上对应的位置如图所示，其中正确的结论是（　　）A．a+b＞0B．|a|＞|b|＞0C．ab＜0D．a2＞b2