A model of China's future double-decker bullet train (双层动车) was displayed by the Chinese Academy of Sciences on Monday, with experts     1     (say) it could reach very high speeds.

Zhang Weihua,     2     bullet train expert, told Science and Technology Daily that the double-decker bullet train will be able to run at the same top speed as a fast single-deck train. But an important problem     3     needs to be solved is that it may lose stability when turning at     4     (extreme) high speeds. But he believes that once design and technical problems such as the train's high center of gravity and large passenger capacity (容量)     5     (solve), the     6     (safe) will be fine when the train operates at proper speeds. Recently Germany and France     7     (plan) to use double-decker technology in the next generation of high-speed trains     8     the goal of improving passenger capacity and economic effectiveness.

China's double-decker bullet train, which is made     9     (aim) at the international market, will have a base speed of 160 km/h. However, when fitted with core components (核心组件) designed according to the current standards for high-speed trains, it will be capable of much     10     (high) speeds.

Chinese tech companies caught the spotlight at the Mobile World Congress in Barcelona, Spain, as they presented 5G phones and creative solutions,     1     (hope) to bring Chinese innovations to the world stage.

It     2     (estimate) that more than 2,400 companies from over 200 countries and regions participated at the event, more than 360 of     3     came from china.

Huawei Technologies Co.     4     (launch) its first   5G foldable smartphone   ahead   of   the   congress, the world’s     5     (large) telecom industry gathering. The phone is seen as dealing a major blow to its rivals, Apple Inc and Samsung Electronics Co. It took more than three years for the company to perfect the folding phone’s hinge (合叶), the most     6     (challenge) technical component.

Combining 5G, the foldable screen, artificial intelligence and a brand-new interface, the company hopes that Mate X will be the first key for consumers     7     (open) the door to 5G smart living. Mate X is quite impressive,     8     a   sound   design   showcasing   Huawei’s   technological   breakthroughs   against   its     9     (compete).

It will,     10    , take some time for most consumers to get their hands on such foldable screens.

The Dujiangyan is the oldest man-made water system in the world, and a wonder in the development of Chinese agriculture.     1     (build) over 2,200 years ago in what is now Sichuan Province in Southwest China, this amazing engineering achievement is still used today.

In ancient times, the region where Dujiangyan now stands     2     (suffer) from regular floods from the Minjiang River. To help the victims of the flooding, Li Bing,     3     region governor, together with his son, decided to find a solution. Li designed a series of     4     (channel) built at different levels along Mount Yulei that would take away the floodwaters while leaving the river     5     (flow) naturally.     6     (good) still, the extra water could be directed to the dry Chengdu Plain, making it suitable for farming.

Once the system     7     (finish), no more floods happened and the people were able to live peacefully. Today, Dujiangyan is admired by scientists from around the world because of one feature. Unlike modern dams,     8     the water is blocked with a huge wall, Dujiangyan still lets waterflow through the Minjiang River     9     (natural), making the ecosystem and fish populations exist     10     peace.

【推荐1】High school students have defeated    1    artificial intelligence device designed to pass the national college entrance exam, in Chengdu City, Sichuan Province.

Forty-three students from liberal arts classes at Chengdu Shishitianfu High School joined the two-hour contest     2    (finish) a math test in the standard national entrance exam against the robot, the brainchild of four years' research by Zhun Xing Yun Xue Technology Co.Ltd.

Students scored 106 points    3    average, outperforming the computer program that had 93 points. She Yujia, a student in the contest, said she felt like    4    (fight) the program on behalf of humans, especially after Google's AlphaGo     5    (beat) professional Go player Lee Sedol of South Korea last year.

Researchers who developed the AI test taker,     6    is also part of a project by the Ministry of Science and Technology, said the failure was due to a poor understanding of concepts in some math problems.

Lin Hui, CEO of the developing company, said more efforts     7    (make) to fix bugs and improve performance of the program in the near future, with a focus on math     8    (apply).

Chinese students are usually separated into science and liberal arts classes at high school, a practice that allows them to stay     9    (compete) in the college entrance exam by choosing     10    (prefer) subjects. Math tests for liberal arts students are usually easier than those given to science students.

On the other hand, new technology     1    (provide)people everywhere with many benefits over the years. For example, the latest weather-tracking computer programmes give people lots of warnings about potential     2    (nature)disasters, which saves many lives. Moreover, the Internet has made it possible for friends and family     3    (keep)in touch easily even if they are on opposite sides of the world. It has also made finding opportunities in life much easier, as it allows people to make larger networks of friends through using social media.