A greeting card is a printed message, or thought, which we send to other people. There is 【小题1】 (usual) a picture on the front and a message inside the card. The custom of sending greeting cards can date back 【小题2】 about 5000 B.C. Greeting cards also played 【小题3】 important part in the holiday of Valentine’s day 【小题4】 people would send messages to 【小题5】 sweethearts. The first printed cards were found in Europe in 1400’s. Europeans sent these 【小题6】 (card) as New Year’s greetings. The modern greeting card 【小题7】 (become) popular in the late 1800’s. Today greeting cards can 【小题8】 (find) for civil and religious holidays, anniversaries, birthdays and just about any occasion you can think of. With the 【小题9】 (develop) of technology, e-cards have appeared. More people are becoming interested in 【小题10】 (use) digital media instead of paper or other traditional materials.

A three-bedroom 3D-printed farmhouse has been built in Wujiazhuang village, Zhangjiakou,   【小题1】 is the co-host city for the 2022 Winter Olympics. With ceilings and walls decorated by weave patterns, Zhao Xiujuan's house covers 【小题2】 area of 106 square meters.

When Xu Weiguo, a professor at Tsinghua University, came up with the idea of building a 3D-printed farmhouse, there was an outpouring of concern from villagers, who 【小题3】 （wonder）whether it would be strong enough. However, Zhao shrugged off 【小题4】 her fellow villagers doubted and made the work go on. The construction 【小题5】 （complete）in two weeks, with only two people on each device.

China's 3D printing technology has been 【小题6】 （wide）used in many fields. “This technology can not only save manpower and construction costs, but also increase 【小题7】 （efficient）and quality,” Xu said, adding that it can keep the design and construction of traditional houses while 【小题8】 （create）beautiful patterns. "There are still a large number of houses and infrastructure（基础设施） 【小题9】 （build）in China in the future, " Xu said. “Intelligent technologies can solve the labor shortage problem faced by the construction industry, freeing workers 【小题10】 their heavy labor.”

At first glance, SoFi looks exactly like a real fish. But if you look 【小题1】(close), it’s not hard to spot the truth: SoFi is a robot, or as 【小题2】 (it)MIT developers call it, “ a soft robotic fish”, according to BBC news.

SoFi 【小题3】 swim, turn and change speeds just like a real fish, and more 【小题4】 (importance), it can take high-resolution photos and videos with a camera 【小题5】(build) into its nose. The robot’s “ soft artificial muscle” is made of a type of rubber, it has two side fins(鳍)for waving, 【小题6】 its nose also hides important electrical components(组成部分).

The team at MIT developed SoFi to swim among real fish to explore where few other robots or humans can, reported the Los Angeles Times. It 【小题7】(operate) with a waterproof video game controller by someone 【小题8】 can be up to 21 meters away.

According to its leading 【小题9】(create) Robert Katzschmann, SoFi, pronounced like the girl’s name “Sophie”, is an abbreviation(缩写)of soft fish--- and was named 【小题10】   a girl he had a crush(暗恋)on in high school.