题目
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.
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.
题目解答
答案
D
解析
本题考查对直升机发展历史的理解。根据题干，选项A表示直升机自1940年以来才被人类研究，选项B表示中国儿童是第一个实现直升机飞行的人，选项C表示直升机被认为比早期飞机更危险，选项D表示有些人认为直升机将被普通个人广泛使用。根据常识和历史背景，选项D是正确的，因为直升机在早期确实被认为有可能被普通个人广泛使用，但实际发展过程中，由于技术、成本和安全等因素，这一设想并未完全实现。