2. Passage Twenty-SevenOut of all the students who enroll in a massive open online course (MOOC)， only about 5 percent complete the course and receive a certificate of accomplishment.This statistic is often cited as evidence that MOOCs are fatally flawed (有缺陷的)and offer little educational value to most students.Yet more than 80 percent of students who fill out a post-course survey say they met their primary objective.How do we look at these two facts? We’re used to focusing on completion rates in higher education， but they’re not the only—or even the most meaningful—indicator of engagement in open online courses.With no cost to enroll， no punishment for dropping out， and little reward for actually earning a certificate， MOOCs are fundamentally different from traditional classes—and students use them in fundamentally different ways.Data from more than 1.8 million students enrolled in 36 MOOCs offered by the University of Pennsylvania show that students treat MOOCs like a buffet (自助餐)， sampling the material according to their interests and career goals.Some are curious about the subject matter and just watch one or two video lectures; others use the discussion forums to connect with their intellectual peers around the world.Of all enrolled students， nearly 60 percent watch at least one video， complete at least one assignment， or post at least once in a forum.So focusing on the tiny fraction of students who complete a MOOC is misguided.The more important number is the 60 percent engagement rate.Students may not finish a MOOC with a certificate of accomplishment， but the courses nonetheless meet the educational goals of millions.In Para.2， the author stresses ().

3. Passage Twenty-SevenOut of all the students who enroll in a massive open online course (MOOC)， only about 5 percent complete the course and receive a certificate of accomplishment.This statistic is often cited as evidence that MOOCs are fatally flawed (有缺陷的)and offer little educational value to most students.Yet more than 80 percent of students who fill out a post-course survey say they met their primary objective.How do we look at these two facts? We’re used to focusing on completion rates in higher education， but they’re not the only—or even the most meaningful—indicator of engagement in open online courses.With no cost to enroll， no punishment for dropping out， and little reward for actually earning a certificate， MOOCs are fundamentally different from traditional classes—and students use them in fundamentally different ways.Data from more than 1.8 million students enrolled in 36 MOOCs offered by the University of Pennsylvania show that students treat MOOCs like a buffet (自助餐)， sampling the material according to their interests and career goals.Some are curious about the subject matter and just watch one or two video lectures; others use the discussion forums to connect with their intellectual peers around the world.Of all enrolled students， nearly 60 percent watch at least one video， complete at least one assignment， or post at least once in a forum.So focusing on the tiny fraction of students who complete a MOOC is misguided.The more important number is the 60 percent engagement rate.Students may not finish a MOOC with a certificate of accomplishment， but the courses nonetheless meet the educational goals of millions.According to Para.3， students choose MOOCs for the following reasons EXCEPT ().

4. Passage Twenty-SevenOut of all the students who enroll in a massive open online course (MOOC)， only about 5 percent complete the course and receive a certificate of accomplishment.This statistic is often cited as evidence that MOOCs are fatally flawed (有缺陷的)and offer little educational value to most students.Yet more than 80 percent of students who fill out a post-course survey say they met their primary objective.How do we look at these two facts? We’re used to focusing on completion rates in higher education， but they’re not the only—or even the most meaningful—indicator of engagement in open online courses.With no cost to enroll， no punishment for dropping out， and little reward for actually earning a certificate， MOOCs are fundamentally different from traditional classes—and students use them in fundamentally different ways.Data from more than 1.8 million students enrolled in 36 MOOCs offered by the University of Pennsylvania show that students treat MOOCs like a buffet (自助餐)， sampling the material according to their interests and career goals.Some are curious about the subject matter and just watch one or two video lectures; others use the discussion forums to connect with their intellectual peers around the world.Of all enrolled students， nearly 60 percent watch at least one video， complete at least one assignment， or post at least once in a forum.So focusing on the tiny fraction of students who complete a MOOC is misguided.The more important number is the 60 percent engagement rate.Students may not finish a MOOC with a certificate of accomplishment， but the courses nonetheless meet the educational goals of millions.The sentence “students treat MOOCs as a buffet” (Para.3)().

5. Passage Twenty-SevenOut of all the students who enroll in a massive open online course (MOOC)， only about 5 percent complete the course and receive a certificate of accomplishment.This statistic is often cited as evidence that MOOCs are fatally flawed (有缺陷的)and offer little educational value to most students.Yet more than 80 percent of students who fill out a post-course survey say they met their primary objective.How do we look at these two facts? We’re used to focusing on completion rates in higher education， but they’re not the only—or even the most meaningful—indicator of engagement in open online courses.With no cost to enroll， no punishment for dropping out， and little reward for actually earning a certificate， MOOCs are fundamentally different from traditional classes—and students use them in fundamentally different ways.Data from more than 1.8 million students enrolled in 36 MOOCs offered by the University of Pennsylvania show that students treat MOOCs like a buffet (自助餐)， sampling the material according to their interests and career goals.Some are curious about the subject matter and just watch one or two video lectures; others use the discussion forums to connect with their intellectual peers around the world.Of all enrolled students， nearly 60 percent watch at least one video， complete at least one assignment， or post at least once in a forum.So focusing on the tiny fraction of students who complete a MOOC is misguided.The more important number is the 60 percent engagement rate.Students may not finish a MOOC with a certificate of accomplishment， but the courses nonetheless meet the educational goals of millions.What is the author’s attitude toward MOOCs?

1. Passage Twenty-EightOn November 19， 1863， Abraham Lincoln went to Gettysburg in Pennsylvania to speak at the National Soldiers Cemetery.The Civil War was still going on.There was much criticism of President Lincoln at the time.He was not at all popular.He had been invited to speak at Gettysburg only out of politeness.The principal speaker was to be Edward Everett， a famous statesman and speaker of the day.Everett was a handsome man and very popular everywhere.It is said that Lincoln prepared his speech on the train while going to Gettysburg.Late that night， alone in his hotel room and tired out， he again worked briefly on the speech.The next day Everett spoke first.He spoke for an hour and 57 minutes.His speech was a perfect example of the rich oratory of the day.Then Lincoln rose.The crowd of 15，000 people at first paid little attention to him.He spoke for only nine minutes.At the end there was little applause.Lincoln turned to a friend and remarked， “I have failed again.” On the train back to Washington， he said sadly， “That speech was a flat failure， and the people are disappointed”.Some newspapers at first criticized the speech， but little by little as people read the speech， they began to understand better.They began to appreciate its simplicity and its deep meaning.It was a speech which only Abraham Lincoln could have made.Today， every American school child learns Lincoln’s Gettysburg Address by heart.Now everyone thinks of it as one of the greatest speeches ever given in American history.In 1863， Abraham Lincoln was ().

2. Passage Twenty-EightOn November 19， 1863， Abraham Lincoln went to Gettysburg in Pennsylvania to speak at the National Soldiers Cemetery.The Civil War was still going on.There was much criticism of President Lincoln at the time.He was not at all popular.He had been invited to speak at Gettysburg only out of politeness.The principal speaker was to be Edward Everett， a famous statesman and speaker of the day.Everett was a handsome man and very popular everywhere.It is said that Lincoln prepared his speech on the train while going to Gettysburg.Late that night， alone in his hotel room and tired out， he again worked briefly on the speech.The next day Everett spoke first.He spoke for an hour and 57 minutes.His speech was a perfect example of the rich oratory of the day.Then Lincoln rose.The crowd of 15，000 people at first paid little attention to him.He spoke for only nine minutes.At the end there was little applause.Lincoln turned to a friend and remarked， “I have failed again.” On the train back to Washington， he said sadly， “That speech was a flat failure， and the people are disappointed”.Some newspapers at first criticized the speech， but little by little as people read the speech， they began to understand better.They began to appreciate its simplicity and its deep meaning.It was a speech which only Abraham Lincoln could have made.Today， every American school child learns Lincoln’s Gettysburg Address by heart.Now everyone thinks of it as one of the greatest speeches ever given in American history.Lincoln was invited to speak at the National Soldiers Cemetery because he was ().

3. Passage Twenty-EightOn November 19， 1863， Abraham Lincoln went to Gettysburg in Pennsylvania to speak at the National Soldiers Cemetery.The Civil War was still going on.There was much criticism of President Lincoln at the time.He was not at all popular.He had been invited to speak at Gettysburg only out of politeness.The principal speaker was to be Edward Everett， a famous statesman and speaker of the day.Everett was a handsome man and very popular everywhere.It is said that Lincoln prepared his speech on the train while going to Gettysburg.Late that night， alone in his hotel room and tired out， he again worked briefly on the speech.The next day Everett spoke first.He spoke for an hour and 57 minutes.His speech was a perfect example of the rich oratory of the day.Then Lincoln rose.The crowd of 15，000 people at first paid little attention to him.He spoke for only nine minutes.At the end there was little applause.Lincoln turned to a friend and remarked， “I have failed again.” On the train back to Washington， he said sadly， “That speech was a flat failure， and the people are disappointed”.Some newspapers at first criticized the speech， but little by little as people read the speech， they began to understand better.They began to appreciate its simplicity and its deep meaning.It was a speech which only Abraham Lincoln could have made.Today， every American school child learns Lincoln’s Gettysburg Address by heart.Now everyone thinks of it as one of the greatest speeches ever given in American history.It can be inferred from the text that ().

4. Passage Twenty-EightOn November 19， 1863， Abraham Lincoln went to Gettysburg in Pennsylvania to speak at the National Soldiers Cemetery.The Civil War was still going on.There was much criticism of President Lincoln at the time.He was not at all popular.He had been invited to speak at Gettysburg only out of politeness.The principal speaker was to be Edward Everett， a famous statesman and speaker of the day.Everett was a handsome man and very popular everywhere.It is said that Lincoln prepared his speech on the train while going to Gettysburg.Late that night， alone in his hotel room and tired out， he again worked briefly on the speech.The next day Everett spoke first.He spoke for an hour and 57 minutes.His speech was a perfect example of the rich oratory of the day.Then Lincoln rose.The crowd of 15，000 people at first paid little attention to him.He spoke for only nine minutes.At the end there was little applause.Lincoln turned to a friend and remarked， “I have failed again.” On the train back to Washington， he said sadly， “That speech was a flat failure， and the people are disappointed”.Some newspapers at first criticized the speech， but little by little as people read the speech， they began to understand better.They began to appreciate its simplicity and its deep meaning.It was a speech which only Abraham Lincoln could have made.Today， every American school child learns Lincoln’s Gettysburg Address by heart.Now everyone thinks of it as one of the greatest speeches ever given in American history.It was a fact that Lincoln’s speech was ().

5. Passage Twenty-EightOn November 19， 1863， Abraham Lincoln went to Gettysburg in Pennsylvania to speak at the National Soldiers Cemetery.The Civil War was still going on.There was much criticism of President Lincoln at the time.He was not at all popular.He had been invited to speak at Gettysburg only out of politeness.The principal speaker was to be Edward Everett， a famous statesman and speaker of the day.Everett was a handsome man and very popular everywhere.It is said that Lincoln prepared his speech on the train while going to Gettysburg.Late that night， alone in his hotel room and tired out， he again worked briefly on the speech.The next day Everett spoke first.He spoke for an hour and 57 minutes.His speech was a perfect example of the rich oratory of the day.Then Lincoln rose.The crowd of 15，000 people at first paid little attention to him.He spoke for only nine minutes.At the end there was little applause.Lincoln turned to a friend and remarked， “I have failed again.” On the train back to Washington， he said sadly， “That speech was a flat failure， and the people are disappointed”.Some newspapers at first criticized the speech， but little by little as people read the speech， they began to understand better.They began to appreciate its simplicity and its deep meaning.It was a speech which only Abraham Lincoln could have made.Today， every American school child learns Lincoln’s Gettysburg Address by heart.Now everyone thinks of it as one of the greatest speeches ever given in American history.Which of the following statements is NOT true according to the passage?

1. Passage Twenty-NineHow can we get rid of garbage (垃圾)? Do we have enough energy sources to meet our future energy needs? These are two important questions that many people are asking today.Some people think that man might be able to solve both problems at the same time.They suggest using garbage as an energy source， and at the same time it can save the land to hold garbage.For a long time， people buried garbage or dumped (倾倒)it on empty land.Now， empty land is scarce.But more and more garbage is produced each year.However， garbage can be a good fuel to use.The things in garbage do not look like coal， petroleum， or natural gas; but they are chemically similar to these fossil fuels.As we use up our fossil-fuel supplies， we might be able to use garbage as an energy source.Burning garbage is not a new idea.Some cities in Europe and the United States have been burning garbage for years.The heat that is produced by burning garbage is used to boil water.The steam that is produced is used to make electricity or to heat nearby buildings.In Paris， France， some power plants burn almost 2 million metric tons of the city’s garbage each year.The amount of energy produced is about the same as would be produced by burning almost a half million barrels of oil.Our fossil fuel supplies are limited.Burning garbage might be one kind of energy source that we can use to help meet our energy needs.This method could also reduce the amount of garbage piling up on the earth.What two problems can man solve by burning garbage?

2. Passage Twenty-NineHow can we get rid of garbage (垃圾)? Do we have enough energy sources to meet our future energy needs? These are two important questions that many people are asking today.Some people think that man might be able to solve both problems at the same time.They suggest using garbage as an energy source， and at the same time it can save the land to hold garbage.For a long time， people buried garbage or dumped (倾倒)it on empty land.Now， empty land is scarce.But more and more garbage is produced each year.However， garbage can be a good fuel to use.The things in garbage do not look like coal， petroleum， or natural gas; but they are chemically similar to these fossil fuels.As we use up our fossil-fuel supplies， we might be able to use garbage as an energy source.Burning garbage is not a new idea.Some cities in Europe and the United States have been burning garbage for years.The heat that is produced by burning garbage is used to boil water.The steam that is produced is used to make electricity or to heat nearby buildings.In Paris， France， some power plants burn almost 2 million metric tons of the city’s garbage each year.The amount of energy produced is about the same as would be produced by burning almost a half million barrels of oil.Our fossil fuel supplies are limited.Burning garbage might be one kind of energy source that we can use to help meet our energy needs.This method could also reduce the amount of garbage piling up on the earth.Which of the following is NOT the result of burning garbage?