Wang Yaping taught Chinese primary and middle school students on Earth physics problems in the zero-gravity environment(失重环境).She prepared for the lecture for a long time.

    Wang, born in January 1980, is from east China's Shandong Province. She was a pilot in the People's Liberation Army Air Force(空军)with experience of 1,600 hours of flying.

    The world's first teacher in space was Christa McAuliffe, a 37-year-old middle school teacher from the United States ,but the Space Shuttle Challenger（挑战者号）disintegrated(崩裂)after 73 seconds into flight on Jan.28,1986. McAuliffe and other six members were killed.

    “Wang's lecture was a pleasant surprise,” said Zhang Xiaguang, an astronaut in the three members of shenzhou 10 spacecraft.“________________(她无论做什么都很优秀).Sometimes we'd like to give her a helping hand ,but she just would not take the hand in help,”said Nie Haisheng.

    Like many young Chinese people, Wang likes photography, music and basketball. She said ,“We are all students in facing the universe(宇宙)。We are looking forward to joining our young friends to learn and explore the mystical(神秘的)and beautiful universe.”

    While you are at the bookstore, you may be faced with a difficult decision: e­ books or paper books? Each one has its advantages and disadvantages. Making the best decision depends on a number of factors(因素).

    An e­ reader can carry a whole library wherever you go, which is great for travelers or those who always want a choice of reading materials. Although e­ readers are convenient, high levels of screen brightness from an electronic device(电子设备) can cause eye problems. A study in the Information Science Research found that young people preferred e­ readers, like smart phones or iPads. That's why most teenagers are short­sighted.

    Many book lovers prefer paper books and value the feeling of them. Paper books are very well designed, they look and smell good, and they carry with them a more human touch. Avid(热衷的) readers prefer reading on paper .Perhaps this is their choice because paper books give them a sense of ownership .It is reported that reading on paper rather than an electronic screen is better for memory and focus .But paper books are heavy and they are not convenient to carry.

    Which is your decision, an e ­book or a paper book?

    On March 31", 2019, a wildfire in Liangshan Yi autonomous prefecture(凉山彝族自治州)led to 31 deaths, including 27 firefighters. And on May 1st, 2016, in Alberta, Canada, a wildfire destroyed an area of nearly 700 square miles. More than 88, 000 people had to leave their homes and thousands of homes were destroyed.

    Wildfires are unexpected, unplanned. And the cause of most wildfires is unsure. To bum, wildfires require the right conditions—fuel, oxygen and heat. And global warring is one of the most important reasons. The high temperatures and dry conditions make the fire spread quickly.

    In many parts of the world, wildfires happen naturally. They are started by lighting(闪电)or some other special weather conditions. In recent years, there have been more wildfires because of dry, hot weather, and changeable weather patterns because of global warning.

    However, many fires are started by people. Sometimes, people clear land for farming. Besides, there are smokers who accidentally set fires.

Wildfires can cause a lot of smoke, which will pollute the air. Lots of lives, property(财产)and valuable forests will soon disappear in wildfires. When trees are burnt down, and heavy rain follows, more disasters such as terrible floods will happen.

    Teachers teach us knowledge. They help us know about the world. We asked some kids to talk about their favorite teachers. Read the passage, and see what they think of their teachers.

    Ms. Kincaid is active. She often takes part in activities in and out of school. Her teaching is interesting. She is very kind. She always takes good care of me.

Nasrene Mroue. 11

    Ms. Palmer is a good teacher because she gives us many chances. She forgives (原谅)us when we do something wrong. She often helps me with my math. Now I' m good at math.

Malachi Draughn

    I think that I learn much important information(信息) from Ms. Green. The information is helpful for my later life. I want to thank Ms. Green for helping make me a better person.

Brody Hoke, a policeman

Mrs. Imel is the best person I know. She is always smiling and saying, I love it! I love it! " She believes(相信) in me and every child she teaches.

Makena Weiscopf, 12

    There is a big store near my home. There are many things in it. (a)Many people go shopping(去购物) in it every day.

    It is a Sunday afternoon. We don't have any food in the fridge(冰箱). My mother and I go to buy some food for dinner. We buy some chicken, fish(鱼), vegetables and fruits. They all look (b) fresh and are not expensive. I buy a blue pencil and an eraser. The (c)shop assistants(售货员)in the store are very friendly(友好的).

    We should not use more water than we actually need. If we do, we will not have enough water in the future.{#blank#}1{#/blank#}It is not a difficult question to answer. If we remove more fresh water than nature replaces, we have taken too much.

    Many cities run campaigns (运动) to get people to stop wasting water. They show them ways they can cut back on water use.{#blank#}2{#/blank#}What's more, they carry out programs that offer money to reduce water use. For example, they give people shower heads and toilets that use less water.{#blank#}3{#/blank#}

    Another threat (威胁) to our water supply is pollution. When our sources of fresh water get polluted, we can no longer use this water. This also endangers (危及) the animals that depend on the water.

    {#blank#}4{#/blank#}We can save lots of water by not letting taps (水龙头) run while we brush our teeth or by turning off taps right after washing hands. By collecting cold water when we're taking warm showers, we can also save water.{#blank#}5{#/blank#}In this way, we can make full use of water.