-
Our Earth is a blue planet. About 71 percent of the planet is water, but people can only use a small amount of it. Only about 3 percent of the world's water is fresh water. It's in lakes, rivers and underground. According to the UN, wastewater problems make water shortages (短缺) even more serious. Our homes, cities and factories make wastewater every day. It pollutes rivers and lakes.
People from different countries have their own tips for saving water.
In Australia most people have a grass lawn (草坪) around their home. They wash their cars on the lawn. The water will go to the grass!
People in Germany collect rainwater to save water. Most new houses have a rainwater collection device (设备). The device collects rainwater from the roof (屋顶), and then sends it to the toilet. If you don't have the device, just put a bucket (桶) under your roof.
1.Only 3 percent of the world's water is ________.
A.seawater B.fresh water C.rainwater D.wastewater
2.Fresh water is in _______
A.lakes B.rivers C.underground D.A, B and C
3.The underlined word it refers to (指的是) ________.
A.the factory B.our home C.the city D.wastewater
4.The underlined word tips probably means ________.
A.notes B.rules C.ways D.problems
5.Why do people in Germany collect rainwater with the device? They want to ________.
A.clean the toilet B.drink it C.wash their cars D.sell it
6.According to the passage, which of the following is NOT TRUE?
A.People can find fresh water in lakes, rivers and underground.
B.Nobody wants to wash their cars on the lawns to save water in Australia.
C.Most new houses in Germany have a rainwater collection device.
D.People can also use a bucket to collect rainwater under the roof in Germany.
-
About seventy percent of our earth _______ by water.
A. is covering B. is covered
C. are covered D. are covering
-
How much do you know about Earth-the planet that we live on? Our knowledge of Earth has been developing since ancient times. However, many puzzles about Earth remain unsolved. Live Science has published a list of the eight biggest mysteries about Earth. Let's look at some of them.
Where did water come from?
When it first came into being 4.5 billion years ago, Earth was a dry rock. So where did all of our water come from? Scientists think that it might have arrived in the form of ice by an asteroid(小行星) from outer space that hit our planet. But this theory has not been confirmed because there is very little related evidence(相关证据)to be studied.
What's in the core(地核)?
Scientists used to study meteorites(陨石)as small examples of Earth, believing that Earth's core was made of iron and nickel(镍). However, a later study in the 1950s proved this way to be wrong because it found that Earth would be too light to provide gravity if its core contained only iron and nickel. Today, scientists continue to bring forward different theories, but none have been confirmed.
How was the Moon born?
Scientists have found that the chemical compositions(成分)of Earth and the Moon are very similar. That suggests that the Moon actually came from Earth. For example, it could be a piece of Earth that separated when Earth hit another planet. It is also possible that when Earth first came into being, it spun(旋转)very fast and threw off enough molten(熔化的)rock to later from the Moon.
1.What's the story mainly about?
A.How Earth came into being. B.Where Earth's water came from.
C.How the Moon was formed. D.Unexplained mysteries about Earth.
2.What do we know about where water may come from?
A.Earth's water may come from ice that melted 4.5 billion years ago.
B.Earth's water may come from a small planet that hit Earth.
C.We don't know where water came from.
D.There is lots of evidence that tells us where water came from.
3.What does the underlined phrase "bring forward" in Paragraph 5 probably mean?
A.Check. B.Raise. C.Improve. D.Receive.
4.Which of the following is TURE according to the passage?
A.Scientists believed Earth's core was made of meteorites.
B.A study in the 1950s proved that Earth's core is made of iron and nickel.
C.The Moon and Earth are made of similar materials.
D.Three possibilities of where the Moon came from are mentioned.
-
How much do you know about Earth—the planet that we live on? Our knowledge of Earth has been developing since ancient times. However, many puzzles (谜) about Earth remain unsolved. Live Science has published a list of the eight biggest mysteries about Earth. Let’s look at some of them.
Where did water come from?
When it first came into being 4.5 billion years ago, Earth was a dry rock. So where did all of our water come from? Scientists think that it might have arrived in the form of ice by an asteroid (小行星) from outer space that hit our planet. But this idea has not been confirmed (证明) because there is very little related evidence(相关证据) to be studied.
What’s in the core (地核)?
Scientists used to study meteorites (陨石) as small examples of Earth, believing that Earth’s core was made of iron and nickel (镍). However, a later study in the 1950s proved this way to be wrong because it found that Earth would be too light to provide gravity (引力) if its core contained only iron and nickel. Today, scientists continue to bring forward different ideas, but none have been confirmed.
How was the moon born?
Scientists have found that the chemical compositions (成分) of Earth and the Moon are very similar. That suggests that the Moon actually came from Earth. For example, it could be a piece of Earth that separated when Earth hit another planet. It is also possible that when Earth first came into being, it spun (旋转) very fast and threw off enough molten (熔化的) rock to later form the Moon.
1.What’s the main idea of the passage?
A.How Earth came into being.
B.Where Earth’s water came from?
C.How the moon was formed?
D.Unexplained mysteries about Earth.
2.What do we know about where water may come from?
A.Earth’s water may come from ice that melted 4.5 billion years ago.
B.Earth’s water may come from a small planet that hit Earth.
C.We don’t know where water came from.
D.There is lots of evidence that tells us where water came from.
3.What does the underlined phrase “bring forward” in Paragraph 5 probably mean?
A.Check B.Raise
C.Improve D.Receive
4.Which of the following is TRUE according to the passage?
A.Scientists used to believe Earth’s core was made of meteorites.
B.A study in the 1950s proved that Earth’s core is made of iron and nickel.
C.The moon and Earth are made of similar materials.
D.Three possibilities of where the Moon came from are mentioned.
-
The surface of Mars is like the surface of earth than planet in our solar system.
A. much; the other B. much; any other
C. more; the other D. more; any other
-
About 70________of the earth ________covered with water.
A.percents; are B.percents; is C.percent; are D.percent; is
-
The surface of Mars is ______like the surface of Earth than_____ planet in our solar system (太阳系)．
A. much； the other B. much； any other
C. more； the other D. more； any other
-
The gravity of the Mars is only about 37．5 percent of _________ of the Earth．
A. one B. it C. that D. those
-
We know that about seventy percent _____ the earth _____ covered by water.
A. /; is B. of; are
C. of; is D. about; are
-
用所给词的适当形式填空(10分)
1.___________, our planet, Earth is becoming more and more crowded.(sad)
2.Most of my classmates had gone to celebrate Mr. Wang’s_________(44) birthday when I got there.
3.Humans on Mars will have to wear special boots to make___________(they) heavier.
4.The dancer fell down while she______________(spin) on the stage.
5.At present, it may be difficult to imagine_______________(develop) the desert.
6.The big prize is for one of the most famous_____________(invent).
7.I don’t think man will have robots______________(control) computers in the future.
8.Are you certain meals in the form of pills are much___________(taste)?
9.How many___________( toy) trains does your brother have?
10.The Summer Palace is a famous Chinese-style garden___________(build) in a natural landscape.