一、李华对火星有所了解，他分享了一些关于火星的知识。根据句意和首字母提示填写单词，看看他说了些什么。
1. Mars is a p far away from the Earth. People will spend several months getting there by spaceship.
2. Everyone must take an a tank to breathe because there isn't oxygen on Mars.
3. There are less g on Mars than on the Earth, so people need to wear special boots when walking on Mars.
4. Life on Mars can be hard because we have no t food to eat.
5. So far, Mars hasn't been p, so it may be a good choice for people to live there in the future.

二、对于太空探索，Simon有自己的见解。用方框中所给单词或短语的适当形式填空，一起来了解一下他的看法。
at the speed of, dried food,
challenge, compare with, special
1. the past, our country's technology of exploring the space has improved greatly.
2. There is no fruit or vegetables on Mars, so people would have to eat .
3. If people travel to space, they should wear helmets that are designed for them.
4. Maybe several years later, people will be able to go to space light by spaceship.
5. It's for us to move to another planet at present, for it will take much time and cost a lot.

三、馆内讲解员介绍了目前前往火星存在的一些困难。根据短文内容和所给首字母提示填写所缺单词，完成讲解员的介绍。
Flying to Mars would be the farthest journey in human history. For the astronauts who visit Mars, they would 1. s a lot because of the special environment there. Surviving this trip would not be easy.
Though space travel is never free of 2. d, it takes a lot more health risks to travel in space for a long time. For one thing, staying in space for long periods makes the human body 3. w. Also, it puts pressure on the back of the eyes and causes eye problems. Then there are space rays to 4. w about. It might lead to a higher risk of health problems, especially for astronauts who will have long journeys.
Astronauts will have to pack 5. l to lift off from the Earth. And they won't be able to get things they need like astronauts on the space station do. Instead, they will take fewer things and they might try growing food and building tools as needed.