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C
Can Seawater Stop Wildfires?
Wildfires swept across Los Angeles for weeks several months ago. Firefighters worked around the clock but faced many problems, including a lack of freshwater. About a week after the fires broke out, planes began to drop seawater on them. Many wondered why seawater wasn't used in the first place since LA is a coastal city. The simple answer is that seawater won't be used unless everything else has failed. Here is why.
△
There are two main ways to send seawater to a fire, but both are hard. One way is to pump seawater into water tanks(将海水泵入水箱)and move it into fire trucks. This takes a lot of time and work. The other way is to use helicopters and planes. They must fly close to the ocean to fill their water tanks. This can be dangerous if the waves are rough.
Damage to equipment(损坏设备)
Most firefighting equipment is made from metals(金属), like iron. Seawater can react with these metals and make the equipment rust(生锈的)more quickly. This can cause the equipment to break and even put the firefighters in danger.
Harm to the environment
Seawater can change the soil and harm the ecosystem. Plants get water through their roots(根). Normally, the salt level in the soil is lower than that in plant root cells. This allows water to move from the soil into the roots. However, seawater can add a lot of salt to the soil. When the soil has a higher level of salt than plant root cells, water runs out of the cells instead of into them. Plants will dry out and die as a result. This change in the soil can last for many years.
()9. When was seawater used to stop the wildfires in LA?
A. As soon as the fires broke out.
B. About a week after the fires broke out.
C. One month before the fires were put out.
D. About a week before the fires were put out.
()10. Which of the following can be put in △?
A. Efforts in cleaning seawater
B. Difficulty in moving seawater
C. High cost of sending seawater
D. Danger of seawater to firefighters
()11. What can seawater do to plants?
A. Make them get more water.
B. Make them grow well.
C. Make them dry out and die.
D. Make them change colors.
()12. What can we learn from the passage?
A. Using seawater is a good way to fight fires.
B. Firefighters must say no to seawater.
C. It is cheaper to use freshwater than seawater.
D. There're some risks when using seawater to fight fires.
Can Seawater Stop Wildfires?
Wildfires swept across Los Angeles for weeks several months ago. Firefighters worked around the clock but faced many problems, including a lack of freshwater. About a week after the fires broke out, planes began to drop seawater on them. Many wondered why seawater wasn't used in the first place since LA is a coastal city. The simple answer is that seawater won't be used unless everything else has failed. Here is why.
△
There are two main ways to send seawater to a fire, but both are hard. One way is to pump seawater into water tanks(将海水泵入水箱)and move it into fire trucks. This takes a lot of time and work. The other way is to use helicopters and planes. They must fly close to the ocean to fill their water tanks. This can be dangerous if the waves are rough.
Damage to equipment(损坏设备)
Most firefighting equipment is made from metals(金属), like iron. Seawater can react with these metals and make the equipment rust(生锈的)more quickly. This can cause the equipment to break and even put the firefighters in danger.
Harm to the environment
Seawater can change the soil and harm the ecosystem. Plants get water through their roots(根). Normally, the salt level in the soil is lower than that in plant root cells. This allows water to move from the soil into the roots. However, seawater can add a lot of salt to the soil. When the soil has a higher level of salt than plant root cells, water runs out of the cells instead of into them. Plants will dry out and die as a result. This change in the soil can last for many years.
()9. When was seawater used to stop the wildfires in LA?
A. As soon as the fires broke out.
B. About a week after the fires broke out.
C. One month before the fires were put out.
D. About a week before the fires were put out.
()10. Which of the following can be put in △?
A. Efforts in cleaning seawater
B. Difficulty in moving seawater
C. High cost of sending seawater
D. Danger of seawater to firefighters
()11. What can seawater do to plants?
A. Make them get more water.
B. Make them grow well.
C. Make them dry out and die.
D. Make them change colors.
()12. What can we learn from the passage?
A. Using seawater is a good way to fight fires.
B. Firefighters must say no to seawater.
C. It is cheaper to use freshwater than seawater.
D. There're some risks when using seawater to fight fires.
答案:
9-12 BBCD
D
Painted with cool cultural dots
Every day at work, I drink water from a teapot with dots(小圆点)all over it. But these aren't just random(随意的)dots. They are part of the aboriginal Australian dot-painting tradition.
The paintings use hundreds of little dots. They come together to make shapes, like animal footprints, the sun or humans. Australia's aboriginal people don't have a written language. They paint dots to tell stories about their culture, environment and ancestors(祖先).
But they don't want outsiders to know their special knowledge about the land. So, they "hide" their stories in dots. It's like a secret code(代码)that only they can completely understand. For example, the aboriginal people paint lots of water holes with dots. These dot-marked water holes help show where to find water in the hot, dry land. And they paint certain patterns(模式)of dots to mark the migration routes of animals. These marked patterns are used to remember the best times and places to hunt. The colors in the paintings are also very important. For example, red often represents the earth and blood while yellow can be used to stand for the sun.
Dot painting has a very long history in Australian aboriginal groups. For many, many years, older people have passed down the art to younger people. This way, they can keep their culture alive. Now, more and more people around the world know about dot painting. In Australia and other countries, you can see these paintings in art galleries. People from different places can look at these beautiful paintings and learn about the culture of Australian aboriginal people.
I'm not aboriginal, but these paintings hold a special place in my heart. They remind me of home, where I first discovered how art connects us to history and tradition.
()13. Why do the aboriginal people use dots in their paintings?
A. To sell their paintings for money.
B. To share their secrets with outsiders.
C. To keep their special knowledge secretly.
D. To make art works look more beautiful.
()14. What does the color yellow often stand for in dot painting?
A. The sun.
B. The earth.
C. Water holes.
D. Animal footprints.
()15. Where can people see dot paintings now?
A. Only in Australia.
B. In art galleries around the world.
C. In the school libraries.
D. Only in the aboriginal communities.
()16. What's the main purpose of the text?
A. To encourage more people to buy dot paintings.
B. To introduce dot painting in different places.
C. To compare dot painting with modern painting.
D. To tell the history and cultural importance of dot painting.
Painted with cool cultural dots
Every day at work, I drink water from a teapot with dots(小圆点)all over it. But these aren't just random(随意的)dots. They are part of the aboriginal Australian dot-painting tradition.
The paintings use hundreds of little dots. They come together to make shapes, like animal footprints, the sun or humans. Australia's aboriginal people don't have a written language. They paint dots to tell stories about their culture, environment and ancestors(祖先).
But they don't want outsiders to know their special knowledge about the land. So, they "hide" their stories in dots. It's like a secret code(代码)that only they can completely understand. For example, the aboriginal people paint lots of water holes with dots. These dot-marked water holes help show where to find water in the hot, dry land. And they paint certain patterns(模式)of dots to mark the migration routes of animals. These marked patterns are used to remember the best times and places to hunt. The colors in the paintings are also very important. For example, red often represents the earth and blood while yellow can be used to stand for the sun.
Dot painting has a very long history in Australian aboriginal groups. For many, many years, older people have passed down the art to younger people. This way, they can keep their culture alive. Now, more and more people around the world know about dot painting. In Australia and other countries, you can see these paintings in art galleries. People from different places can look at these beautiful paintings and learn about the culture of Australian aboriginal people.
I'm not aboriginal, but these paintings hold a special place in my heart. They remind me of home, where I first discovered how art connects us to history and tradition.
()13. Why do the aboriginal people use dots in their paintings?
A. To sell their paintings for money.
B. To share their secrets with outsiders.
C. To keep their special knowledge secretly.
D. To make art works look more beautiful.
()14. What does the color yellow often stand for in dot painting?
A. The sun.
B. The earth.
C. Water holes.
D. Animal footprints.
()15. Where can people see dot paintings now?
A. Only in Australia.
B. In art galleries around the world.
C. In the school libraries.
D. Only in the aboriginal communities.
()16. What's the main purpose of the text?
A. To encourage more people to buy dot paintings.
B. To introduce dot painting in different places.
C. To compare dot painting with modern painting.
D. To tell the history and cultural importance of dot painting.
答案:
13.C 14.A 15.B 16.D
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