A huge lake of salty water appears to be buri...

A huge lake of salty water appears to be buried deep in Mars，scientists reported this week．The presence of water raises the chances of finding life on the red planet．The discovery is based on observations by a European spacecraft．It has excited experts．Water is necessary for life，and scientists have long hoped to prove that it is present on Mars．

Cassie Stuurman is a geophysicist at the University of Texas．In 2016，she found evidence of a huge ice deposit(沉积)on Mars．“If these researchers are right，this is the first time we’ve found evidence of a large water body on Mars．”Stuurman said．Researchers are not yet sure how deep the area of water is．So，they cannot say whether it is an underground pool，or just an area of soft and wet soil．

In order to find the water，Italian researchers examined radar signals．The signals were collected over three years by the European Space Agency’s Mars Express spacecraft．The results suggest that a 20-kilometer-wide water body lies below ice that is 1.5 kilometers thick．They believe the area is close to the planet’s southern pole．

Mars is very cold，but salt in the water may have kept it from freezing．It is the same as when you put salt on a road to prevent ice from forming．The water would be extremely cold，right at the point where it’s about to freeze．And it would be salty．Such conditions are not ideal for life to form．But，she said there are bacteria on the earth that have been able to survive in similar conditions．

Mars has been a popular planet for exploration，with some groups placing instruments on its surface and others examining it from space．In May，NASA launched another spacecraft，the InSight Mars lander which will dig deep into the data under the surface after it reaches a flat area of the planet in November．

1.Where do the Italian researchers believe the water body on Mars is?

A. In a poo1．

B. Above ice．

C. In soft and wet soil．

D. Near the southern pole of Mars．

2.What can we learn about the water on Mars from the text?

A. It is probably filled with creatures．

B. It flows on the surface of Mars．

C. It is mainly in the form of solid．

D. It is probably at the freezing point．

3.What will the InSight Mars lander do when it reaches Mars?

A. Dig a hole to protect the lander itself．

B. Explore the surface of Mars．

C. Gather information under the surface of Mars．

D. Examine Mars from space．

4.What is the main idea of the text?

A. Life used to exist on Mars．

B. Researchers find new species on Mars．

C. Mars will be the humans’second home．

D. Water is buried beneath Mars’surface．

高三英语阅读理解困难题查看答案及解析

Mars(火星) appears to be flowing with small streams of salty water, at least in the summer, scientists reported Monday. “It suggests that it would be possible for there to be life today on Mars,” NASA’s science mission chief, John Grunsfeld, said at a news conference on September 28, 2015.

The streams are about 12 to 15 feet wide and 300 feet or more long, scientists said. “What we’re dealing with is wet soil, thin layers of wet soil, not standing water,” said Aifred McEwen of the University of Arizona at Tueson, the principal scientist for the Mars Reconnaissance Orbiter’s high-resolution imaging experiment.

Because liquid water is essential to life, the findings could have major implications for the possibility of Martian life. The researchers said further exploration is needed to determine whether microscopic life exists on the planet.

The presence of liquid water could also make life easier for astronauts visiting or living on Mars. Water could be used for drinking and for creating oxygen and rocket fuel. NASA’s goal is to send humans there in the 2030s.

The evidence of flowing water consists largely of dark, narrow streaks(条痕) on the surface that tend to appear and grow during the warmest Martian months and fade the rest of the year.

Mars is extremely cold even in summer, and the streaks are in places where the temperature is as low as minus 10 degrees Fahrenheit. But salt can lower the freezing point of water and melt ice.

The source of the water is a mystery. Scientists noted it could be melting ice. It could be an underground aquifer, which is rock or sand that can hold water. It is possibly water vapor from the thin Martian atmosphere. Or it may be a combination Michael Meyer, lead scientist for NASA’s Mars exploration program, said the only definitive way for now to determine whether there’s life on Mars is to collect rocks and soil for analysis on Earth—something a U. S. lander set for lift-off in 2020 will do.

1.According to John Grunsfeld, there seems to be　　　　　　　　　 on Mars.

A.salty water B.standing water

C.rocket fuel D.human beings

2.Scientists are uncertain about the　　　　　　　　　　 of the water on Mars．

A.state B.source

C.temperature D.taste

3.What matters to the existence of liquid water on Mars?

A.The distance from the sun B.The favorable climate

C.The gravity of the earth D.The salt in it

4.What would be the best title for the text?

A.Streams of Water Spotted on Mars

B.Astronauts will Land on Mars

C.NASA’s Mars Exploration Program

D.A Breakthrough in the Exploration of Mars

高三英语阅读理解中等难度题查看答案及解析

Mars( 火星) appears to be flowing with small streams of salty water, at least in the summer,scientists reported Monday.　 "It suggests that. it would be possible for there to be life today on Mars," NASA's science mission chief, John Grunsfeld, said at a news conference on September 28, 2015. The streams are about 12 to 15 feet wide and 300 feet or more long, scientists said.

"What we're dealing with is wet soil. thin layers of wet soil, not standing water," said Aifred McEwen of the University of Arizona at Tueson ! the principal scientist for the Mars Reconnaissance Orbiter's high-resolution imaging experiment.

Because liquid water is essential to life, the findings could have major implications for the possibility of Martian life. The researchers said further exploration is needed to determine whether microscopic life exists on the planet.

The presence of liquid water could also make life easier for astronauts visiting or living on Mars. Water could be used for drinking and for creating oxygen and rocket fuel. NASA's goal is to send humans there in the 2030s.

The evidence of flowing water consists largely of dark, narrow streaks(条痕) on the surface that tend to appear and grow during the warmest Martian months and fade the rest of the year.

Mars is extremely cold even in summer, and the streaks are in places where the temperature is as low as minus 10 degrees Fahrenheit.　 But salt can lower the freezing point of water and melt ice.

The source(源头) of the water is a mystery. Scientists noted it could be melting ice. It could be an underground aquifer, which is rock or sand that can hold water.　 It is possibly water vapor from the thin Martian atmosphere, Or it may be a combination Michael Meyer, lead scientist for NASA's Mars exploration program, said the only definitive way for now to determine whether there's life on Mars is to collect rocks and soil for analysis on Earth - something a U. S. lander set for lift-off in 2020 will do.

1.What would be the best title for the text? '

A Streams of Water Spotted on Mars

B. Astronauts will Land on Mars

C. NASA's Mars Exploration Program

D. A Breakthrough in the Exploration of Mars

2.According to John Grunsfeld, there seems to be　　　　　　　　　 on Mars.

A. salty water

B. standing water

C. rocket fuel

D. human beings

3.Scientists are uncertain about the　 　　　　　　　　　 of the water on Mars.

A. state

B. source

C. temperature

D. taste

4.What matters to the existence of liquid water on Mars?

A. The distance from the sun.

B. The favorable climate.

C. The gravity of the earth

D．The salt in it．

高三英语阅读理解中等难度题查看答案及解析

Mars( 火星) appears to be flowing with small streams of salty water, at least in the summer,　 scientists reported Monday.　 "It suggests that. it would be possible for there to be life today on Mars," NASA's science mission chief, John Grunsfeld, said at a news conference on September 28, 2015.

The streams are about 12 to 15 feet wide and 300 feet or more long, scientists said. "What we're dealing with is wet soil. thin layers of wet soil, not standing water," said Aifred McEwen of the University of Arizona at Tueson ! the principal scientist for the Mars Reconnaissance Orbiter's high-resolution imaging experiment.

Because liquid water is essential to life, the findings could have major implications for the possibility of Martian life. The researchers said further exploration is needed to determine whether microscopic life exists on the planet.

The presence of liquid water could also make life easier for astronauts visiting or living on Mars. Water could be used for drinking and for creating oxygen and rocket fuel.　 NASA's goal is to send humans there in the 2030s.

The evidence of flowing water consists largely of dark, narrow streaks(条痕) on the surface that tend to appear and grow during the warmest Martian months and fade the rest of the year.

Mars is extremely cold even in summer, and the streaks are in places where the temperature is as low as minus 10 degrees Fahrenheit.　 But salt can lower the freezing point of water and melt ice.

The source(源头) of the water is a mystery. Scientists noted it could be melting ice. It could be an underground aquifer, which is rock or sand that can hold water. It is possibly water vapor from the thin Martian atmosphere, Or it may be a combination.

Michael Meyer, lead scientist for NASA's Mars exploration program, said the only definitive way for now to determine whether there's life on Mars is to collect rocks and soil for analysis on Earth - something a U. S. lander set for lift-off in 2020 will do.

1.What would be the best title for the text?

A Streams of Water Spotted on Mars

B. Astronauts will Land on Mars

C. NASA's Mars Exploration Program

D. A Breakthrough in the Exploration of Mars

2.According to John Grunsfeld, there seems to be　　　　　　　　　 on Mars.

A. salty water

B. standing water

C. rocket fuel

D. human beings

3.Scientists are uncertain about the　 　　　　　　　　　 of the water on Mars.

A. state

B. source

C. temperature

D. taste

4.What matters to the existence of liquid water on Mars?

A. The distance from the sun.

B. The favorable climate.

C. The gravity of the earth

D．The salt in it．

高三英语阅读理解中等难度题查看答案及解析

Mars（火星）appears to be flowing with small streams of salty water,at least in the summer,scientists reported Monday."It suggests that it would be possible for there to be life today on Mars," NASA's science mission chief,John Grunsfeld,said at a news conference on September 28,2015.

The streams are about 12 to 15 feet wide and 300 feet or more long,scientists said."What we're dealing with is wet soil.Thin layers of wet soil,not standing water," said Aifred McEwen of the University of Arizona at Tueson,the principal scientist for the Mars Reconnaissance Orbiter's high-resolution imaging experiment.

Because liquid water is extremely necessary to life,the findings could have major possible effects for the possibility of Martian life.The researchers said further exploration is needed to determine whether microscopic life exists on the planet.

The presence of liquid water could also make life easier for astronauts visiting or living on Mars.Water could be used for drinking and for creating oxygen and rocket fuel.NASA's goal is to send humans there in the 2030s.

The evidence of flowing water consists largely of dark,narrow streaks（条痕）on the surface that tend to appear and grow during the warmest Martian months and fade the rest of the year.

Mars is extremely cold even in summer,and the streaks are in places where the temperature is as low as minus 10 degrees Fahrenheit.But salt can lower the freezing point of water and melt ice.

The source of the water is a mystery（神秘的事物）.Scientists noted it could be melting ice.It could be an underground aquifer（砂石含水层）,which is rock or sand that can hold water.It is possibly water vapor from the thin Martian atmosphere,or it may be a combination Michael Meyer,lead scientist for NASA's Mars exploration program, said the only definitive way for now to determine whether there's life on Mars is to collect rocks and soil for analysis on Earth-something a U.S.lander set for lift-off in 2020 will do.

1.What matters to the existence of liquid water on Mars?

A. The distance from the sun.　　 B. The favorable climate.

C. The gravity of the earth.　　 D. The salt in it.

2.According to John Grunsfeld,on Mars there seems to be　　　　 .

A. salty water　　 B. standing water

C. rocket fuel　　 D. human beings

3.Scientists are uncertain about the　　　　 of the water on Mars.

A. state　　 B. source

C. temperature　　 D. taste

4.What would be the best title for the text?

A. Streams of Water Spotted on Mars

B. Astronauts Will Land on Mars

C. NASA's Mars Exploration Program

D. A Breakthrough in the Exploration of Mars

高三英语阅读理解中等难度题查看答案及解析

C

Mars( 火星) appears to be flowing with small streams of salty water, at least in the summer, scientists reported Monday．"It suggests that．it would be possible for there to be life today on Mars," NASA's science mission chief, John Grunsfeld, said at a news conference on September 28, 2015．

The streams are about 12 to 15 feet wide and 300 feet or more long, scientists said．"What we're dealing with is wet soil．thin layers of wet soil, not standing water," said Aifred　 McEwen of the University of Arizona at Tueson ! the principal scientist for the Mars Reconnaissance Orbiter's high-resolution imaging experiment．

Because liquid water is essential to life, the findings could have major implications for the possibility of Martian life．The researchers said further exploration is needed to determine whether microscopic life exists on the planet．

The presence of liquid water could also make life easier for astronauts visiting or

living on Mars．Water could be used for drinking and for creating oxygen and rocket

fuel．NASA's goal is to send humans there in the 2030s．

The evidence of flowing water consists largely of dark, narrow streaks(条痕) on

the surface that tend to appear and grow during the warmest Martian months and fade

the rest of the year．

Mars is extremely cold even in summer, and the streaks are in places where the

temperature is as low as minus 10 degrees Fahrenheit．But salt can lower the freezing point of water and melt ice．

The source of the water is a mystery．Scientists noted it could be melting

ice．It could be an underground aquifer, which is rock or sand that can hold water．It is possibly water vapor from the thin Martian atmosphere, Or it may be a combination Michael Meyer, lead scientist for NASA's Mars exploration program, said the only definitive way for now to determine whether there's life on Mars is to collect rocks and soil for analysis on Earth - something a U．S．lander set for lift-off in 2020 will do．

1.What would be the best title for the text? '

A．Streams of Water Spotted on Mars

B．Astronauts will　 Land on Mars

C．NASA's Mars Exploration Program

D．A Breakthrough in the Exploration of Mars

2.According to John Grunsfeld, there seems to be　　　　　　　　　 on Mars．

A．salty water

B．standing water

C．rocket fuel

D．human beings

3.Scientists are uncertain about the　　　　　　　　　　 of the water on Mars．

A．state

B．source

C．temperature

D．taste

4.What matters to the existence of liquid water on Mars?

A．The distance from the sun．

B．The favorable climate．

C．The gravity of the earth

D．The salt in it．

高三英语阅读理解中等难度题查看答案及解析

D

Mars（火星）appears to be flowing with small streams of salty water，at least in the summer，scientists reported Monday．“It suggests that．it would be possible for there to be life today on Mars，”NASA's science mission chief，John Grunsfeld，said at a news conference on September 28，2015．

The streams are about 12 to 15 feet wide and 300 feet or more long，scientists said．“What we're dealing with is wet soil．thin layers of wet soil，not standing water，”said Aifred McEwen of the University of Arizona at Tueson！the principal scientist for the Mars Reconnaissance Orbiter's high-resolution imaging experiment．

Because liquid water is essential to life，the findings could have major implications for the possibility of Martian life．The researchers said further exploration is needed to determine whether microscopic life exists on the planet．

The presence of liquid water could also make life easier for astronauts visiting or living on Mars．Water could be used for drinking and for creating oxygen and rocket fuel．NASA's goal is to send humans there in the 2030s．

The evidence of flowing water consists largely of dark，narrow streaks(条痕) on the surface that tend to appear and grow during the warmest Martian months and fade the rest of the year．

Mars is extremely cold even in summer，and the streaks are in places where the temperature is as low as minus 10 degrees Fahrenheit．But salt can lower the freezing point of water and melt ice．

The source（源头）of the water is a mystery．Scientists noted it could be melting ice．It could be an underground aquifer，which is rock or sand that can hold water．It is possibly water vapor from the thin Martian atmosphere，Or it may be a combination Michael Meyer，lead scientist for NASA's Mars exploration program，said the only definitive way for now to determine whether there's life on Mars is to collect rocks and soil for analysis on Earth - something a U．S．lander　 set for lift-off in 2020 will do．

1.What would be the best title for the text？

A．Streams of Water Spotted on Mars

B．Astronauts will　 Land on Mars

C．NASA's Mars Exploration Program

D．A Breakthrough in the Exploration of Mars

2.According to John Grunsfeld，there seems to be ________on Mars．

A．salty water

B．standing water

C．rocket fuel

D．human beings

3.Scientists are uncertain about the __________of the water on Mars．

A．state　　 B．source　　 C．temperature　　 D．taste

4.What matters to the existence of liquid water on Mars？

A．The distance from the sun．

B．The favorable climate．

C．The gravity of the earth

D．The salt in it．

高三英语阅读理解简单题查看答案及解析

Main Types of Water Pollution

When we think of Earth’s water resources, we think of huge oceans, lakes, and rivers. 1. The most obvious type of water pollution affects surface water. For example, a spill from an oil tanker creates an oil layer that can affect a vast area of an ocean.

2. A great deal of water is held in underground rock structures known as aquifers(含水层). Water stored underground in aquifers is known as groundwater. Aquifers feed our rivers and supply much of our drinking water. They can also become polluted, for example, when weedkillers used in people’s gardens drain into the ground.

Surface water and groundwater are the two types of water resources that pollution affects. 3. If pollution comes from a single location, such as a pipe attached to a factory, it is known as point source pollution. 4. A great deal of water pollution happens not from one single source but from many different sources. This is called nonpoint source pollution.

Sometimes pollution that enters the environment in one place has an effect hundreds or even thousands of miles away. 5. One example is the way radioactive waste travels through the oceans from unclear reprocessing plants in England and France to nearby countries such as Ireland and Norway.

A. Besides, we think of bottled water.

B. This is known as transboundary (跨界的) pollution.

C. Not all of Earth’s water sits on its surface, however.

D. Water resources like these are called surface water.

E. There are also two different ways in which pollution can occur.

F. Pouring oil from your car down a drain can lead to water pollution.

G. Another example of point source pollution is an oil spill from a tanker.

高三英语七选五中等难度题查看答案及解析

Main Types of Water Pollution

When we think of Earth’s water resources, we think of huge oceans, lakes, and rivers. 1. The most obvious type of water pollution affects surface water. For example, a spill from an oil tanker creates an oil layer that can affect a vast area of an ocean.

2. A great deal of water is held in underground rock structures known as aquifers(含水层). Water stored underground in aquifers is known as groundwater. Aquifers feed our rivers and supply much of our drinking water. They can also become polluted, for example, when weedkillers used in people’s gardens drain into the ground.

Surface water and groundwater are the two types of water resources that pollution affects. 3. If pollution comes from a single location, such as a pipe attached to a factory, it is known as point source pollution. 4. A great deal of water pollution happens not from one single source but from many different sources. This is called nonpoint source pollution.

Sometimes pollution that enters the environment in one place has an effect hundreds or even thousands of miles away. 5. One example is the way radioactive waste travels through the oceans from unclear reprocessing plants in England and France to nearby countries such as Ireland and Norway.

A. Besides, we think of bottled water.

B. This is known as transboundary (跨界的) pollution.

C. Not all of Earth’s water sits on its surface, however.

D. Water resources like these are called surface water.

E. There are also two different ways in which pollution can occur.

F. Pouring oil from your car down a drain can lead to water pollution.

G. Another example of point source pollution is an oil spill from a tanker.

高三英语七选五中等难度题查看答案及解析

A woman was dug out           after being buried deep in the ruins for more than 200 hours.

高三英语单项填空中等难度题查看答案及解析