What were some of the technological advances in china at this time?

The technological advances that have been developed in China now make life easier.

The technological advance currently in China is mixing with the daily life of citizens, creating new habits in them.

Among these technologies the most disregarded are:

The digital payment: Chinese citizens no longer charge cash, all payments are made digitally, reducing theft.

Digital commerce: In China, shared products are already used, mainly means of transport, such as renting a bicycle with your smartphone.

High-speed trains: The new high-speed Fuxing trains allow the capital of China to be united in a few hours with Shanghai (approximately 1200 km)  

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Explanation:

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the first question's answer is a.