Many people travel to different places in the world by air. Usually it takes a long time, perhaps half a day, for passengers to stay in the plan. So airlines（航空公司）offer passengers food. But it is common that they feel bad about food taste. Do you agree?

    To solve this problem, airlines try hard to improve their food. They would like to do so because they don't want to lose customers.

    However, according to scientific research, part of the reason why plane food tastes bad is that at high altitude（海拔）we can not taste things as well as we do on the ground. Also scientists have found that our noses become very dry even before a plane takes off. As the plane moves up, the change in air  pressure（气压）reduces one third of the sensibility（感觉）of our taste buds（味蕾）. So our taste buds become senseless. The sad face, however, is that our noses don't know it.

    All of these help explain why food on the plane tastes so bad. They also help explain why airlines choose to offer passengers salty and spicy（辛辣的）food. Without doing so, the food would be tasteless.

    Now there are many researches on this. According to one of them, some volunteers are asked to lie with their feet higher than their heads for weeks. And scientists write down their feelings about food taste.

    Though scientists try their best, it is not as easy as they thought. Because they can't deal with the special environment successfully, such as the change in air pressure, making food taste good is still hard for them.

A

    China's first artificial intelligence (AI) textbook series designed for primary and secondary school students is expected to be introduced into hundreds of campuses across the country in 2019. The textbooks will be used for elective courses or as part of school﹣based curriculums.

    Significant progress is being reported in China in AI technological research and development, with authorities now moving to promote AI﹣related education.

    According to the publisher, East China Normal University Press, the series will have 10 volumes, with six volumes published so far. Each has its own theme, with 12 to 14 main chapters and 2 to 4 chapters of activities. This series covers the educational demands of students from primary school to high school on AI and provides a systematic framework of AI knowledge.

    The books have been used in three schools in Shanghai as a pilot program and well received by students, according to Wang Jiqing, chief editor of the series.

New books recommended (被维荐) for both adults and children.

Please match the names of the books with the right brief introductions(简介).

{#blank#}1{#/blank#}

The book is for children aged 5-10. With beautiful pictures and vivid language, it can let young readers know the history and function of the karez underground irrigation system（坎儿井灌溉系统) in Xinjiang.

{#blank#}2{#/blank#}

The beauty of the ruined(被毁坏的)Old Summer Palace could only be found in paper. However, Guo Daiheng, a professor of Tsinghua University, and her students give life to 60% of the Palace's look with the modern technology. The book, with hundreds of pictures, is a record of their work.

{#blank#}3{#/blank#}

The book is written by Tan Kai. It is about Isabel Crook, a woman who spent many years on China's English language education and the communication between China and Canada.

{#blank#}4{#/blank#}

Written by Wu Bin, once the director of the Shenyang Palace Museum, the book is about special people and great events in history when Chinese culture went abroad.

In which column of a newspaper can we find the text? {#blank#}5{#/blank#}

A. Culture.     B. Business.     C. Health.     D. Sports.

International Women's Day is on 8 March every year. On this day people celebrate the{#blank#}1{#/blank#} （achieve） of women all over the world，but also continue to fight for women's equal rights. 

International Women's Day can be traced back to 1908，when women went out onto the streets to say they wanted{#blank#}2{#/blank#} （short） working hours and better pay. In 1910，there was a meeting about women's rights，where a woman{#blank#}3{#/blank#} （call） Clara Zetkin had the idea for an international day for women. The{#blank#}4{#/blank#} （one） International Women's Day happened the next year，in 1911. 

Why do we need a special day for women？Around the world，most countries have a male leader and most businesses have male leaders. Men{#blank#}5{#/blank#} （pay） more than women for doing the same job. In many countries，men also do less work at home and get{#blank#}6{#/blank#} better education. We need change，{#blank#}7{#/blank#} the changes need to start with girls. We need to change things because being equal is a basic human right. 

How is International Women's Day celebrated？People celebrate{#blank#}8{#/blank#} remembering and talking about important women from history and today. People also have special events{#blank#}9{#/blank#} （speak） about all the changes we still need to make. More{#blank#}10{#/blank#} （important），boys and men celebrate this day too. If everyone works together，we can change things faster. 

In ancient China, when friends or relatives were separating, they would pick a willow twig（柳条） and give it to the person who was leaving and wished for him {#blank#}1{#/blank#}. In Chinese, the word for "willow" has the {#blank#}2{#/blank#} pronunciation as the word for "stay". 

Many Chinese poets liked writing about willows in their works. One of the most famous {#blank#}3{#/blank#} is A Farewell Song（《送元二使安西》）by Wang Wei. It reads, 

No dust is raised on the road met with morning rain,

The willows by the hotel{#blank#}4{#/blank#} so fresh and green.

I invite you to drink a cup of wine again,

West of the Sunny Pass no more friends will be seen.

Nowadays, willow twigs can also be seen in modern art. There was an amazing {#blank#}5{#/blank#} about willow twigs. 365 people were {#blank#}6{#/blank#} willow twigs in their hands on the green stage. At the same time, an ancient painting of weeping willows appeared on the LED screen. The setting of 365 people stood for 365 days, and the colour green meant the {#blank#}7{#/blank#} of spring. The performance was{#blank#}8{#/blank#} praised by the audience. " I was totally attracted by {#blank#}9{#/blank#} Chinese culture, " one of them said. 

In short, giving a willow twig to a person is not saying goodbye {#blank#}10{#/blank#} asking him to stay. {#blank#}11{#/blank#} is the beauty of Chinese culture.