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In the future, people may travel to Mars（火星）by water-powered spaceship（宇宙飞船）! Today's spaceships are fine for getting things into space, but they are not so good at travelling long distances（距离）. 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（阶段）now, but scientists think such a spaceship could be developed（开发）soon.
The key to the water-powered spaceship is the engine（发动机）. Usual engines push spaceships by burning fuel. The water engine will use steam（蒸汽）, created by solar panels（太阳能板）that heat（加热）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 spaceships like this. These spaceships are made of a strong material. Two of them have already been sent up into space. 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（优点）of such a spaceship would be the cost. The balloon spaceship uses water to push it through space and costs about one thirtieth of a usual spaceship. Such savings naturally encourage（鼓励）more research（研究）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?
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 the cost.
( ) 2. What do you think is suitable for “▲”?
A. use steam B. push spaceships
C. heat water D. carry that much water
( ) 3. Besides（除了）growing food, what else might astronauts（宇航员）do with the rest of the water?
A. Take a hot bath. B. Heat dangerous things.
C. Blow up a balloon. D. Change the temperature on Mars.
( ) 4. On which website can we probably read this passage?
A. www.freedictionary.com/power. B. www.moon.cn/music.
C. www.chinadaily.com.cn/culture. D. www.space.com/spaceflight.
The key to the water-powered spaceship is the engine（发动机）. Usual engines push spaceships by burning fuel. The water engine will use steam（蒸汽）, created by solar panels（太阳能板）that heat（加热）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 spaceships like this. These spaceships are made of a strong material. Two of them have already been sent up into space. 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（优点）of such a spaceship would be the cost. The balloon spaceship uses water to push it through space and costs about one thirtieth of a usual spaceship. Such savings naturally encourage（鼓励）more research（研究）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?
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 the cost.
( ) 2. What do you think is suitable for “▲”?
A. use steam B. push spaceships
C. heat water D. carry that much water
( ) 3. Besides（除了）growing food, what else might astronauts（宇航员）do with the rest of the water?
A. Take a hot bath. B. Heat dangerous things.
C. Blow up a balloon. D. Change the temperature on Mars.
( ) 4. On which website can we probably read this passage?
A. www.freedictionary.com/power. B. www.moon.cn/music.
C. www.chinadaily.com.cn/culture. D. www.space.com/spaceflight.
答案
1-4 BDAD
