【单选题】Huawei Mate 10 pro, a popular smart phone, when it was first introduced in the market 3 years ago, its initial price was 4899 RMB, few people could actually afford it, the phones were purchased only b...
【单选题】听力原文: The world's first completely automatic railway has been built under the busy streets of London. The railway is called the Victoria Line, and it is part of the complete London underground railway...
A.
The workers on the underground platforms were replaced by machines.
B.
It became the first completely automatic railway in the world.
C.
A completely automatic line was added to its network.