题目内容：

The well-known "new great inventions" of modern China have made our daily lives more convenient.

High-speed trains  China created its first high-speed railway line in 2008. Since then, the number of passenger trips has grown by over 30 per cent every year. By 2016, more than 5 billion trips had been taken on the trains. By 2020, one-fifth of the country's 150,000-km railway network will be used by the trains. This network will link more than 80 per cent of the major cities across China.

Mobile payment Mobile payment is turning China into a "cashless society". Instead of paying by cash (现金), customers now pay for their goods and some kinds of bills simply by typing a short password into the Alipay or WeChat app on their mobile phone.

Shared bikes China has surprised the world with how quickly shared bikes are widely used. Nowadays, bike users can simply pick up or park the bikes on the street through GPS and smartphone apps. China's two leading bike-sharing companies, Mobike and Ofo, have been opening their overseas markets in Singapore, the UK and the USA.

Online shopping With around 751 million Internet users, China has been the world's largest and fastest-growing online shopping market. Because of lower costs and fewer licensing requirements(执照要求), it's easier for sellers to open an online shop in China. In 2016, more than 20 million jobs of rural areas were created, with over 8. 1 million running their own online shops.

1.What's the passage mainly about?

A. The fast-developing technology.    B. Modern China.

C. China's new great inventions.    D. Convenient daily lives in China.

2.By 2020, more than       of the major cities across China will be linked by the railway network.

A. 30％    B. 50%    C. 80％    D. 20%

3.Mobile payment makes shopping more convenient in China because customers

A. can go shopping without mobile phones    B. needn't take cash

C. don't have to use a password    D. needn't pay the bills

4.Shared bikes can be picked up or parked______________.

A. on the street    B. in Mobike and Ofo    C. in parks    D. in markets

5.          can make online shopping develop so fast in China.

A. Lower costs    B. Fewer licensing requirements

C. More job chances    D. A, B ＆ C