1 . What will life be like in 100 years? Some people believe that humans could live on the planet Mars by the year 2100. The Earth will be crowded and there will be more     1     (pollute) then. It is hoped that people could build a     2     (good) world on Mars. Here     3     (be) what life there could be like in the future.

Humans can’t live without water, air or food. So far, nobody     4     (know) whether there would be enough water or air on Mars for people. Moreover, scientists are not sure whether     5     (plant) could grow on Mars. Food would most possibly be in     6     form of pills (药片) and would not be so tasty.

Compared     7     life on the earth, life on Mars would be better in some ways. People would have more space. They might live in houses with huge comfortable rooms. Also, robots would do a lot of     8     (they) work so that they could have more time to relax. There would     9     (probable) be no schools on Mars. Every student would study at online schools with “e-teachers”.

Life on Mars would be interesting     10     challenging. However, it takes time. So the most important thing we need to do now is to protect our planet—the Earth!

2 . Do you want to celebrate your birthday in space? It would be very different from what you might do on earth.     1     The candles could not be lit because astronauts cannot start a fire in the spaceship.     2     Voices are almost the only things that are not changed by being weightless, which means that everything has almost no weight in space.

Some astronauts feel sick for the first few days in space. Some feel as if they have a cold all the time. That’s because without gravity, the fluids (液体) in their bodies move towards their heads. Their faces look a little fatter.     3    

And because gravity is not pressing on the spine (脊椎). The spine relaxes and stretches (舒展).     4     But when they come back on earth, they shrink (收缩) to their regular height.

Since nothing has weight, astronauts can lift heavy objects easily.     5     However, it is harder to stay still in space than to move around, so the astronauts always hold onto something or tie themselves to something.

3 . It is widely agreed that the overuse of coal and oil has caused serious environmental problems. Scientists are trying to find new clean energies that do not pollute the air, the water or the ground. Solar power(太阳能)is one of them.

Solar power is a kind of electricity which is produced by taking energy from the sun, using solar panels(面板，电池板). The power is easy to get and will never be used up. Whenever it is sunny, there is the power. The power is clean and renewable. It helps to reduce waste and pollution, which is great for the environment. For some areas that are too far away to send electricity to, solar power is especially necessary. People there use solar power for lights, TVs, computers, washing machines, fridges and many other things.

Therefore, more and more countries, such as China, the USA, Japan and India, encourage scientists to develop practical(实用的)technology to put solar power to use. However, the power is not as widely used as expected(预期的).

One of the challenges(挑战)is that a solar power system needs sunshine. Countries or areas with a lot of rain, like the UK, are not suitable to develop such power systems(系统). Secondly, a solar power station requires a very large site(地点)to fix(安装)enough solar panels to collect sunlight and change it into electricity. What’s more, solar panels are expensive at present though the energy itself doesn’t cost anything.

Today scientists are working hard to develop more practical and cheaper solar power systems. Maybe one day solar power will be one of the most important clean energies in our life.

From the moon to Mars, scientists have been looking for water — the key to life — in the solar system for many years. Recently, they have turned to Jupiter(木星)!

Jupiter is a gas giant(巨星). It doesn’t have an Earth-like surface. We can see strips(条纹) around it. They are actually cold, windy clouds.

On April 14, the European Space Agency’s (ESA) JUICE spacecraft successfully lifted off from French Guiana in South America. JUICE, short for “Jupiter Icy Moons Explorer”, will collect data(数据) from Jupiter and its three moons, Europa, Ganymede and Callisto.

The three moons are believed to have big oceans of liquid water(液态水) under their icy shells(壳). According to ESA, he water on those moons could be six times as much as the amount in Earth’s oceans. The mission “will change our understanding of the solar system”, wrote Scientific American.

In 1998, NASA’s Galileo spacecraft found that Europa might be ejecting(喷射) water as far as 160 kilometers into space. That gave scientists the idea of studying the icy moons of Jupiter.

The oceans under these moons are likely to be tens of kilometers deep. But they are also trapped under tens of kilometers of ice, making it very difficult to study them. Although JUICE cannot land on the surface, it has lots of high-tech equipment to study the moon’s environment, including spectral imaging(光谱成像) tools and radar(雷达). They could give more data on things like the thickness of the oceans, their salt content(含量), and their distance from the icy shells above, reported Phys.org.

“The main goal is to understand whether there are habitable (可居住的) environments among those icy moons and around a giant planet like Jupiter,” JUICE team member Olivier Witasse said during a press conference (发布会) on April 6.

Some scientists believe that Mars is the planet that is more likely to support human life away from Earth.

They believe that it’s possible for humans to reach Mars by 2030. However, there are many things to prepare before this can happen.     1     Recently, scientists have sent robots to Mars to gather information about the planet.

Putting people on Mars will include planning how a person will live on Mars. At its shortest distance Mars is 55 million kilometers away from Earth.     2     And astronauts would have to stay on Mars for over 18 months before Earth and Mars are at their closest distance again. The difficulties would include how much food and other things would be needed for over two years in space and how such things would be carried.

    3     They would need to prepare both their minds and bodies for such a long trip away from Earth. NASA set up a special research building in Hawaii. A group of astronauts stayed in this research building for 366 days. During their stay, they had to deal with what they might have to deal with on Mars.     4     They had to live with each other in a very small space. They also had to deal with the problem of having lots of time with little or nothing to do. They couldn’t receive help from people outside for the whole time they were inside.

    5     There is no doubt about it.

Fifty years ago, China     1     (successful) launched its first satellite Dongfanghong 1 and started a new page in space exploration. To     2     /mɑːk/ its 50th anniversary, the China National Space Administration announced the name for the country’s Mars planetary exploration program on April 24.

The mission Tianwen got     3     (it) name from a long poem Tianwen written by Qu Yuan,     4     famous poet of the Warring States Period. In the poem, Qu raised a series of questions about the sky, stars and the real world which reflected his doubts on traditional ideas and his pursuit (追求) of     5     (true).

So far, China has made great progress     6     space exploration. In 1970, China launched its first man-made Earth satellite, making China the     7     (five) country in the world to launch man-made satellites independently.

Over the past few years, China’s Shenzhou series have been     8     (design) to explore outer space. This time the Tianwen series carried out the first Mars exploration mission,     9     it is a milestone (里程碑) for China’s move toward space. With the names     10     /diːp/ roots in Chinese traditional culture, Tianwen shows the determination of Chinese people to move farther into space than ever before.