What scientists Johan Feenstra and Rob Hayes did was that______. A．they made an electronic newspaper B．they created a piece of videoscreen-like paper C．they made a tiny piece of primitive e-paper D．they invented the electrowetting technology
A. A．they B.they C.they D.they
【参考答案】
C 细节题。由题干中的JohanFeenstraandRobHayes定位至首段第二句，该句指出：两位科学家认为......