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.”

    Do you often eat out？Do you often like to use disposable (一次性的) chopsticks？Do you think the chopsticks are safe？ {#blank#}1{#/blank#}.

    China produces 80 billion (十亿) pairs of such chopsticks every year. {#blank#}2{#/blank#}. Can you imagine how many trees have to be cut down every year？20 million. Can you imagine how old the trees are？20 years old.   

    Many people choose to use such chopsticks because they think they are cleaner. In fact，they're not safe. {#blank#}3{#/blank#}.

    Several months ago, Huang Bo, a popular actor, wrote a message on his micro blog (微博)．{#blank#}4{#/blank#} Once he went to a restaurant with his friends. He tried to wash the disposable chopsticks. He was surprised to find the chopsticks turned the water yellow and gave off a bad smell.

    That's true. The smell show that they may be dealt with sulphur (硫磺) and other chemicals (化学制品)． That's very bad for people's health.

    {#blank#}5{#/blank#}. It is not only good for our own health but also helpful to save the environment.