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)().

37.Tom returned to his house after a holiday， only to find it ().

A. 　to be broken into

B. 　was broken into

C. 　had broken into

D. 　had been broken into

40.His efforts to develop new energy sources ()to be rewarding.

A. 　turned up

B. 　turned back

C. 　turned out

D. 　turned away

40.()Sunday， the students are at home.

A. 　Being

B. 　To be

C. 　It is

D. 　It being

40.Theory is based on practice and ()serves practice.

A. 　in turn

B. 　in tone

C. 　in return

D. 　in practice

4. Passage SeventeenNo one knows how man learned to make words.Perhaps he began by making sounds like those made by animals.Perhaps he grunted like a pig when he lifted something heavy.Perhaps he made sounds like those he heard all round him——water splashing， bees humming， a stone falling to the ground.Somehow， he learned to make words.As the centuries went by， he made more and more new words.This is what we mean by language.People living in different countries made different kinds of words.Today there are about fifteen hundred different languages in the world.Each contains many thousands of words.A very large English dictionary， for example， contains four or five hundred thousand words.But we do not need all these.Only a few thousand words are used in everyday life.The words you know are called your vocabulary.You should try to make your vocabulary bigger.You’re supposed to read as many books as you can.There are plenty of books written in easy English for you to read.You will enjoy them.When you meet a new word， you should find it in your dictionary.Your dictionary is your most useful book.Man ()to make sounds.

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 Thirty-ThreeWe all know that DNA has the ability to identify individuals but， because it is inherited， there are also regions of the DNA strand which can relate an individual to his or her family (immediate and extended)， tribal group and even an entire population.Molecular Genealogy (宗谱学)can use this unique identification provided by the genetic markers to link people together into family trees.Pedigrees (家谱)based on such genetic markers can mean a breakthrough for family trees where information is incomplete or missing due to adoption， illegitimacy or lack of records.There are many communities and populations which have lost precious records due to tragic events such as the fire in the Irish courts during Civil War in 1921 or American slaves for whom many records were never kept in the first place.The main objective of the Molecular Genealogy Research Group is to build a database containing over 100，000 DNA samples from individuals all over the world.These individuals will have provided a pedigree chart of at least four generations and a small blood sample.Once the database has enough samples to represent the world genetic make-up， it will eventually help in solving many issues regarding genealogies that could not be done by relying only on traditional written records.Theoretically， any individual will someday be able to trace his or her family origins through this database.In the meantime， as the database is being created， molecular genealogy can already verify possible or suspected relationships between individuals.“For example， if two men sharing the same last name believe that they are related， but no written record proves this relationship， we can verify this possibility by collecting a sample of DNA from both and looking for common markers (in this case we can look primarily at the Y chromosome (染色体)，” explains Ugo Perego， a member of the BYU Molecular Genealogy research team.If two men suspected for some reason they have a common ancestor， ().

7.He is ()about his chances of winning a gold medal in the Olympics next year.

A. 　optimistic

B. 　optional

C. 　outstanding

D. 　obvious

37. Questions 36 to 40 are based on the following passage.Some people have said aging is more a slide into forgetfulness than a journey towards wisdom.However， a growing body of research suggests that late-in-life learning is possible.In reality， education does an aging brain good.Throughout life， people’s brains constantly renovate themselves.In the late 1960s， British brain scientist Geoffrey Raisman spied growth in damaged brain regions of rats through an electron microscope; their brains were forging new connections.This meant brains may change every time a person learns something new.Of course， that doesn’t mean the brain isn’t affected by the effects of time.Just as height usually declines over the years， so does brain volume: Humans lose about 4 percent every decade starting in their 40s.But that reduction doesn’t necessarily make people think slower; as long as we are alive and functioning， we can alter our brains with new information and experiences.In fact， scientists now suspect accumulating novel experiences， facts， and skills can keep people’s minds more flexible.New pathways can strengthen our ever-changing mental structure， even as the brain shrinks.Conventional fixes like word puzzles and brain-training apps can contribute to mental durability.Even something as simple as taking a different route to the grocery store or going somewhere new on vacation can keep the brain healthy.A desire for new life challenges can further boost brainpower.Research about aging adults who take on new enterprises shows improved function and memory as well as a reduced risk of mental disease.Openness—a characteristic defined by curiosity and a desire for knowledge—may also help folks pass brain tests.Some folks are born with this take-in-the world attitude， but those who aren’t as genetically gifted aren’t necessarily out of luck.While genes can encourage an interest in doing new things， a 2012 study in the journal Psychology and Aging found completing reasoning tasks like puzzles and number games can enhance that desire for novel experiences， which can， in turn， refresh the brain.That’s why brain scientist Richard Kennedy says “It’s not that old dogs can’t learn new tricks.It’s that maybe old dogs don’t realize why they should.”What can we conclude from Geoffrey Raisman’s finding?

A. 　Brain damage seriously hinders one’s learning.

B. 　Brain power weakens slower than we imagine.

C. 　Brains can refresh and improve with learning.

D. 　Brains forge connections under new conditions.

1、近年来，随着科技发展，电子产品越来越多，学生的汉字书写能力大大降低。假定你是校书法协会的会长，为了让同学们重视书写，写一封倡议书，内容包括:1.减少对电子产品的依赖，多动手记笔记;2.养成练书法和写日记的习惯。