As we all face the novel coronavirus (新型冠状病毒), protecting yourself is the same as protecting others. Here is some safety ______ for you from the World Health Organization (WHO) to help prevent the coronavinus.

Stay away from crowds and wear masks

The virus can spread from person to person. If you have to go to crowded places, remember to wear a mask. Keep at least one meter of distance between ______ and others, especially those who are coughing or sneezing.

Why? The coronavirus can be spread through mucus droplets (粘液飞沫) and travel one to two meters in the air before falling to the ground. The droplets can be spread ______ by sneezing or coughing than by speaking. If you are too close, you can take in the virus. Wearing a mask can prevent droplets from reaching your face or mouth.

Open the window to ventilate (通风) the room

Keep proper indoor ventilation while you're at home. Open windows to let in fresh air during the day. It's best to do this three times a day for 15 minutes to half an hour each time.

Why? According to the research, indoor air is often more polluted than outdoor air. The simple act of opening a window even in cold weather can reduce the pollution. Therefore, keep the window open, ______ you may catch the virus when it builds up to a certain amount.

Keep up good habits

Still, it's necessary for you to keep healthy habits such as eating a balanced and exercising often, as well as getting ______ sleep.

Why? Doing these things can ______your immune system (免疫系统), making it less likely for you to catch the virus. Good habits are directly related to fewer illnesses and better health.

Wash hands properly

Remember to wash your hands before eating, after going to the bathroom, coming home, coming into contact with rubbish and touching animals. Avoid ______ your eyes, nose and mouth before washing your hands.

Why? Your hands might touch surfaces that can be polluted by the virus. This is especially important when you open doors which have been used by quite a few people. Washing your hands often ______ soap and water for at least 20 seconds can stop the virus from entering your body.

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8.________

In the future, people may travel to Mars (火星) by water-powered spaceship! Today's spaceships are fine for getting things into space, but they are not so good at travelling long distances. These spaceships burn chemical fuels (燃料) and they are very expensive. Scientists say that a water-powered spaceship could make the trip to Mars much cheaper. The idea is just in the planning stages now, but scientists think such a spaceship could be developed soon.

The key to the water-powered spaceship is the engine (发动机). Regular engines push spaceships by burning fuel. The water engine will use steam, created by solar panels (太阳能板) that heat water to a high temperature. Of course, the spaceship will have to carry a lot of water for the long trip to Mars.

Today's spaceships could not carry that much water. But scientists think that a spaceship blown up like a balloon will be able to.

One US company has already developed a spaceship like this. These spaceships are made of a strong material. Two of them have already been sent up into space, using rockets and then later filled with air. "Balloon" spaceships could be very large and carry enough water for a long trip. With the "Balloon" spaceships, enough water could be carried to power the engines and grow food during the trip. And the people on the spaceship might even get to take a hot bath!

Scientists say the biggest advantage of such a spaceship would be cost. The "Balloon" spaceship uses water to push it through space and costs about one thirtieth of a normal spaceship. Such savings naturally encourage continued research into balloon spaceships and water engines. If these scientists are correct, we may soon be on our way to Mars in a spaceship powered by water.

1.Which sentence best describes the main idea of the passage above?

A.The key to the water-powered spaceship is the engine.

B.In the future, people may travel to Mars by water-powered spaceship.

C.One US company has already developed a spaceship like this.

D.Scientists say the biggest advantage of such a spaceship would be cost.

2.What do you think is omitted (省略) at the end of the underlined sentence?

A.use steam B.push spaceships

C.heat water D.carry that much water

3.Besides growing food, what else might astronauts do with the rest of the water?

A.Take a hot bath. B.Freeze dangerous things.

C.Blow up a balloon. D.Change the surface of Mars.

4.On which website can we probably read this passage?

A.www. freedictionary. com/power B.www. mooc. cn/music

C.www. chinadaily. com. cn/culture D.www. space. com/spaceflight

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