Think about the distance（距离） you traveled in the last six months of your life. About how many miles（kilometers） did you go? Lucid went quite a distance. On March 22, 1996, she started a journey. She traveled 188 days, 4 hours, and 14 seconds in total. This is a little over six months. So what distance did Lucid travel? She went 75.2 million miles（1,203,200,000 kilometers）!

    How could Lucid go so far? How could she journey so fast? Lucid was an American astronaut and she was in space. She lived on a space station. The space station was the Russian space station Mir. She lived and worked with two Russian astronauts.

    On Mir, it was hard for Lucid to know what day it was. Why? Mir. did not stay in one place. It orbited the Earth. It went around the Earth. Mir's orbit meant that darkness did not mean the day was over. Darkness fell many times during a 24-hour period. Darkness fell about every 45 minutes. Lucid did something to help her remember what day it was. She wore pink socks on every seventh day. The pink socks reminded Lucid about something else, too. The pink socks helped Lucid remember that Jell-O would be served for dinner. On Mir, Jell-O was a special treat. It was only served on Sunday.

    Lucid worked hard to deserve the honor of working on Mir. She went to school for a long time. She was one of the first six women to be accepted into the astronaut-training program. She flew on several American missions. When accepted for Mir, she had to learn Russian in less than 18 months. On Mir, Lucid conducted many experiments. One experiment she conducted was with wheat. Lucid grew wheat. Growing plants in space was important, because green plants could provide oxygen and food for space travelers.

    March 20th is World Water Day every year. According to a report from the United Nations, more than half of the world's major rivers have serious water loss and are polluted.

    The Yellow River, the world's fifth longest river, watered some of the oldest farms on earth.

    {#blank#}1{#/blank#}Its source（源头）on Qinghai-Tibet Plateau is drying up. In most of the past 35 years, it didn't reach the sea.

    The Nile in Egypt, running 6, 650 km, is the longest river in the world.{#blank#}2{#/blank#}Now it is down to 2 billion m³ or so. Australia's Murray River reaches the sea only every other year. One fifth of America's Rio Grande has no water, either.

   {#blank#}3{#/blank#}

    Mostly it's damming（筑坝）and global warming that make rivers dry.{#blank#}4{#/blank#}Now about 45, 000 of them lie across the world's rivers. They hold back around 15% of the world's fresh water from running to the sea.

{#blank#}5{#/blank#}Warmer weather takes water away. The glacier（冰川）are becoming smaller. The source of the Yellow River is drying up because of it. Global warming has had certain effects on water sources. Droughts （干旱） happening around the world make people pay more attention to this fact.

{#blank#}1{#/blank#}⑴Research suggests that at least 64% of people now spend up to four hours daily of spare time in front of a screen. Just as TV watching has been linked to higher chances of being fat and getting diseases.

{#blank#}2{#/blank#}⑵When you're at home, make it a rule that you can't be online if the sun is shining. Instead, you have to go for a walk, ride a bike, swim or get some other kinds of healthy physical activities for at least an hour before you can pull out your phone or tablet, or take a seat at the computer.

{#blank#}3{#/blank#}⑶Social networks have changed computer and mobile use for people of all ages. Whether it's Facebook, Twitter, Instagram or Snapchat, limit the amount of time you spend on social media.

{#blank#}4{#/blank#}⑷Challenge yourself to read at least 30 pages of a great book before you check your computer or mobile phone. Pick the right reading material and you'll soon find you've discovered an enjoyable pastime.

{#blank#}5{#/blank#}⑸It's amazing how much you can achieve when you're not glued to (长时间盯着) a screen. Do a list of one-hour evening projects. Some suggestions are organizing kitchen cupboards, cleaning your bedroom. Then try to do one each evening.

     Danny and Jenny are talking about their school science fair. They are very excited. Danny is ready for the big science fair next year. He hopes to win first prize. His project is about silk worms. She is interested in that. She made a video about silk worms. She has a small piece of old silk. She also has a silk worm for the visitors. She thinks silk worms are interesting. What's Danny's project about? It's all about donuts. He talks about the history of donuts. He will make ten different kinds of donuts. You can taste them if you go to the science fair.

    Look at the photo. 这是克拉克先生的一张全家福。The old man is Tom Clark. He is Mr Clark's father. Mr Clark is a worker. His wife(妻子), Helen Clark, is a teacher. They have two daughters. They are Lucy and Lily. Lucy and Lily have a cousin, Mark. Mark's parents love them very much.