During the May Day holiday, many Chinese people went out for travel,     1    (show) the potential of the country’s holiday economy. Guangzhou and Chongqing were among the top domestic (国内的) cities in terms of consumer    2     (popular). In the meantime, Thailand, Japan and South Korea became some of the     3     (hot) overseas destinations during the five-day holiday.

Aside from traditional popular destinations, county tourism has developed into a new fashion and brought in new vitality (活力) into the tourism market. The tourism growth rate of small counties and towns is higher. Data from Alipay showed that many young     4     (generation) chose to go to attractions in small towns. Yili in Xinjiang, Yanbian in Jilin, Diqing and Pu’er in Yunnan have seen the largest year-on-year increase in cross-regional payments.

Tourists’ continuous enthusiasm for domestic travel is also proved by other factors, such as the number of short videos     5     (publish). During the holiday,     6     total number of posts on WeChat video accounts increased. Among them, scenic spots like West Lake     7     (become) popular destinations for video account users recently. Concerts, art exhibitions and other cultural activities have also played a significant role     8     improving cultural and tourism consumption. Cities such as Changzhou, Hefei, Beijing, and Yantai received high attention during this time period,     9     drove growth in local hotel, transportation, and dining services.

Furthermore, the inbound (入境的) tourism market is further heating up as visa-free policies and easy payment services provide     10     (convenient) for foreigners traveling to China.

In the future, everybody will have a Harry Potter invisibility cloak in the closet, said Chu Junhao,     1     academician of the Chinese Academy of Sciences in Shanghai on Saturday.

At the Super Science Night     2     (hold) by Bilibili, China’s major video-sharing platform, Chu showed     3     invisibility can be achieved with special technologies and materials. He asked two staff members to hold a panel in front of him.     4    (initial) , the lower part of his body was visible through the panel. After rotating the panel 90 degrees, his lower half disappeared,     5     the stage behind him could still be clearly seen.

The magic was realized by a lenticular (透镜的) grating composed     6     rows of tiny cylindrical (圆柱形的) convex (凸面的) lenses, and each vertical cylindrical convex lens can shrink and thin objects parallel to it, so that light can be refracted (折射的) , according to Chu. When a row of cylindrical convex lenses forms a grating, several images     7    are too small to be noticed by the eye     8    (produce) achieving an invisibility effect. Chu also showed several other ways     9    (invisible) , such as using two substances with similar refractive indices and a plane mirror to create reflection imaging.

“Invisibility in science fiction will become    10    (real) as invisibility technology and material develop,” he said. “More invisibility equipment will change our life, such as invisible rooms that can provide better privacy and invisible hearing-aids.”