在职申硕英语考试

根据网考网考试中心的统计分析，以下试题在2019/6/12日在职申硕英语考试习题练习中，答错率较高，为：47%
【单选题】What is said about the development of the helicopter


A．Helicopters have only been worked on by man since 1940.
B．Chinese children were the first to achieve flight in helicopters.
C．Helicopters were considered more dangerous than the early airplanes.
D．Some people thought they would become widely used by average individuals.