The following are the messages from Mike's moments (朋友圈) on WeChat during the trip to Beijing.

    Today is July 5, my birthday, the first day of our trip. It's 2:30 p. m. I'm riding a bike with my parents and my little brother Bob in Beihai Park. We are singing, listening to birds, and having a lot of fun.

    Today is July 6. It's the second day of our trip. We plan to visit the Great Wall. There area lot of people along the way. I feel a little tired, but I'm happy! While we are climbing the mountain, I talk about my future (将来的) job with my parents. What do I want to be? Ha! Maybe a teacher or a singer.

    My parents are visiting their old friend, a famous writer, at her place. I am having lunch with Bob and watching a show in Deyunshe. The food isn't so delicious but the show ... Well, it's so humorous and interesting. I really like it.

    It is the fourth day of our trip. We're going back home at 6:00 p. m. It's 10:00 a m. now. We are visiting the famous Chocolate Factory and making chocolate by ourselves happily. We are really having a great time here! Sweet Kiwi! I love you!

    Twenty years ago, my father, John, wanted to be a businessman. He wanted to be rich. So he worked very hard and every day he went home very late.

    One night when he came home from work, a robber stopped him and wanted to take his money. My father was very afraid. He didn't want to lose his money. But he didn't know what to do. Luckily a policeman came and caught the robber. My father thanked the policeman politely.

    Now my father is a policeman. He wants to help other people.

Back home, Qian at once {#blank#}1{#/blank#} helping China develop a space program. He started the Institute of Mechanics in Beijing, where he trained young scientists. He worked on many important space {#blank#}2{#/blank#}. In 1960, China's first rocket and first missile were launched(发射) {#blank#}3{#/blank#}. In 1970, China launched its first satellite. It is largely because of Qian's {#blank#}4{#/blank#} that China so quickly developed a space program, and became only the third country to send a manned rocket into space in

2003. 

Qian watched this rocket launch on television. He was by he will always be {#blank#}5{#/blank#} for his great contributions(贡献). He working so hard for his country, even through difficult times, helping develop the space program that pushed China into the future. 

Astronauts would face dangers both getting to and surviving (生存) on Mars. Let's learn about surviving a trip to Mars.

What would it take to keep people safe and healthy on a trip to Mars? Scientists are already working on it, though the trip may be many years later.

Over the last 60 years, many spaceships have flown by orbited（沿轨道运行）and even landed on the Red Planet. However, machines cannot replace humans. That's why the United States, China and other countries want to send people to Mars. But surviving on this trip would not be easy.

A trip to Mars would be the farthest journey in human(人类) history. Mars is about 225 million kilometers away, so it would take astronauts at least 180 days to reach there. However, it only takes a few days to get to the Moon.

Space travel is dangerous. For one thing, staying in space for long periods makes the human body weak. Also, it puts pressure behind the eyes and causes eye problems. But gravity(重力) machines could help.

Then there's space radiation(辐射) to worry about. It is bad for astronauts when they have long journeys. Scientists are working out the issue. They have found that taking certain vitamins can help.

Astronauts will have to pack light to lift off from the earth. But they won't be able to get the things they need easily. Astronauts on the space station practice for this by growing lettuce and other food in space. Engineers are developing 3D printing techniques（技术）which can allow future Mars astronauts to build what they want.

Jack's friend Sally isn't fine these days.

One day she asks Jack for help. And she tells(告诉)Jack about her food. For breakfast. She always eats some bread. For lunch, she always has some chicken. She likes eating ice-cream and a hamburger in the evening. 

"They're not healthy for you, Sally," Jack says. "I know, but I like them," Sally says. "What about vegetables? Do you like eating carrots?" Jack asks. "No, I don't," Sally says.

"Sally, don't eat ice-cream. You must eat some vegetables and fruit. They are healthy food," Jack says. "I think you're right," Sally says.

In the next days, Sally always eats vegetables and fruit. And she is well now.