Five cloned pigs，whose organs are much less likely to be rejected(排斥) by a patient，have been born in the U．S.
More than 62,000 people in the U．S. alone are waiting to ____ donated hearts，lungs and so on.The number of human donors falls far short of ____.Pig organs are of a(n) ____ size to human organs，and some scientists hope they might be used to help meet the ____.But previous attempts to transplant pig tissue into humans have ____.
The five pigs ____ a gene that adds a sugar to the surface of pig cells.The sugar would ____ immune(免疫的) rejection of the tissue.“This advance provides a neartime ____ for overcoming the problem that there is not enough human organs for transplants，”says an expert.“This is the ____ gene for overcoming the ____ stage of rejection.”
____，scientists warn that much more work is necessary ____ organs from copies of the pigs could be transplanted into humans.Human genes will need to be added，to ____ rejection of the organ in the long term.There are also ____ that pig viruses could infect patients.
Cloning techniques were ____ to the production of the pigs.Genes can only be knocked out(去除) in a single cell.Cloning of these single cells then allowed the ____ of a whole animal in which the gene was knocked out in every cell.But the PPL researchers have ____ in knocking out only one copy of the gene.The team will now attempt to knock out both copies of the gene.
The team will also ____ tests to investigate whether a virus from the pigs could infect human cells.“Although a lot of the work is very ____，we’re still very far off being able to grow an organ，” says Julia，who is working on this project and quite ____ to creating similar knockout pigs with researchers at the University of Missouri.
A．exchange B．check C．possess D．receive
A．discussion B．demand C．doubt D．distance
A．beneficial B．identical C．similar D．certain
A．shortage B．condition C．satisfaction D．argument
A．continued B．failed C．finished D．paused
A．lack B．include C．make D．change
A．leave B．cause C．block D．destroy
A．supply B．ambition C．contribution D．solution
A．only B．rare C．key D．safe
A．last B．whole C．next D．early
A．However B．Therefore C．Besides D．Finally
A．because B．before C．if D．after
A．prevent B．ignore C．judge D．weaken
A．regrets B．emotions C．concerns D．interests
A．simple B．vital C．unusual D．basic
A．collection B．application C．reception D．creation
A．delighted B．succeeded C．joined D．believed
A．conduct B．plan C．design D．study
A．perfect B．strange C．exciting D．disappointing
A．opposed B．used C．devoted D．suited
Bill White’s father is a lawyer. In his time, he likes to get out in the country and take some of animals.
For a long time, Bill had wanted to go with his father on one of his . But his father didn’t take Bill along with him he was fifteen.
He and Bill drove to the farm which to his uncle in the afternoon. They the night there, so that they could out early the next morning. Uncle Steve and his son Larry, who was sixteen, were going to go out with them.
It was still dark when Bill heard the alarm the next morning. He wondered why it was running so early. He couldn’t remember he was. He turned over and looked at the clock. It was 5 o’clock. Then he that he was at the and that he was going out to take pictures with his father. He jumped out of bed and got quickly.
He ran downstairs. The others were already in the . Uncle Steve was cooking bacon and eggs. There was a pot of coffee on the stove. It good.
They ate breakfast quickly. They didn’t talk , because they didn’t want to up the other people in the house. They filled a thermos bottle hot coffee and took some sandwiches Aunt Grace, Uncle Steve’s wife, had made for them. They gathered their camera and started out.
A．busy B．spare C．enough D．limited
A．foods B．drawings C．paintings D．pictures
A．trips B．buses C．animals D．mountains
A．after B．when C．until D．unless
A．led B．stuck C．got D．belonged
A．cost B．spent C．slept D．took
A．start B．begin C．walk D．step
A．telephone B．machine C．computer D．clock
A．where B．how C．who D．what
A．quickly B．sleepily C．quietly D．suddenly
A．imagined B．pronounced C．forgot D．remembered
A．mountain B．town C．farm D．station
A．dressed B．ordered C．eaten D．prepared
A．bathroom B．kitchen C．study D．bedroom
A．seemed B．felt C．tasted D．smelled
A．many B．soundly C．much D．highly
A．wake B．go C．put D．come
A．of B．with C．in D．by
A．that B．what C．after D．before
A．cover B．supply C．operator D．equipment（设备）
A strange thing happened to me last Sunday．It was such a beautiful day that I drove to go for a look in the country．
On the way back , my car stopped．It was gas on a lonely road far from a town．I decided to walk I found someone who could ome gas．
I had walked almost a mile I finally found a house near the road．I was glad to see it, it was getting dark．
I knocked at the door and a little old lady long white hair answered．She said,
“I waiting for you for a long time．Come in． is almost ready．”“But I only come some gas,”I answered．I couldn’t imagine she was talking about．“Oh, Alfred! Gas? You used to like tea．”
I quickly explained that my car was out of gas, she didn’t seem to hear me．She just calling me Alfred and talking about how long since she had seen me．She was acting very strangely and I was anxious to ． she went to get tea, I went out of the house as fast as I could．
Fortunately, there was another house down the road and I was able to buy the gas I needed．When I told the man about my he said,“Oh, that’s Miss Emily．She lives herself in that big house．She’s out of her mind, but she wouldn’t hurt ．She is still waiting for the man she was supposed to marry thirty years ago．The day before their wedding he left home and came back because of the war．”
A．school B．home C．town D．country
A．run out of B．out of C．burning D．running out
A．until B．when C．so that D．because
A．fetch B．sell C．buy D．send
A．before B．so C．after D．since
A．if B．but C．because D．though
A．with B．of C．had D．wore
A．was B．am C．had been D．have been
A．Gas B．Coffee C．Tea D．Lunch
A．for B．with C．without D．buy
A．when B．what C．why D．that
A．but B．though C．and D．so
A．suggested B．kept C．stopped D．enjoyed
A．had it been B．it had been C．has it been D．it has been
A．stay B．leave C．speak D．answer
A．Before B．As soon as C．As long as D．After
A．incident B．affair C．experience D．adventure
A．on B．for C．by D．with
A．anyone B．someone C．everyone D．none
A．Soon B．often C．never D．seldom
In a small village, there lived a potter(陶工) who had a donkey. Every day his donkey would carry soil from the ______ to his house. Since the field was quite far off, the potter would ______ under a tree midway, tying(拴) his donkey nearby.
One day, the potter ____ to take the rope with which he tied the donkey every day. When he reached the ____, he became worried and didn’t know what to do. At that time, a saint(圣人) ____ to be passing by. When the potter told the saint what his ____ was, he said, “Take the ____ to the place where you tie him every day. ____ to tie him using an imaginary rope. He won’t run away.” The potter did what the saint had said.
When he woke up, to his ___ and relief, he found the donkey standing in the ____ place. But to his frustration, when he prepared to leave for ____, the donkey did not move. ____, the potter saw the wise saint again and told him about the donkey’s ____ behavior. The saint said, “Go and pretend to untie the rope.” The potter ____ the saint’s advice.
Now the donkey was ready to leave for home. The potter thanked the wise saint and went home ____ his donkey.
A．factory B．garden C．field D．village
A．stand B．rest C．sing D．dance
A．forgot B．decided C．expected D．agreed
A．stone B．tree C．bridge D．house
A．failed B．attempted C．happened D．managed
A．animal B．plant C．problem D．result
A．bird B．flower C．donkey D．rope
A．Believe B．Learn C．Wish D．Pretend
A．surprise B．disappointment C．anger D．regret
A．similar B．special C．same D．wrong
A．field B．school C．home D．hospital
A．Quickly B．Luckily C．Unfortunately D．Badly
A．funny B．foolish C．proper D．strange
A．offered B．followed C．refused D．received
A．happily B．sadly C．seriously D．casually
Joy in the journey
If you have ever been discouraged because of failure, please read on. For often, achieving what you set out to do is not the important thing. Let me explain.
Two brothers decided to dig a deep hole behind their house. As they were working, a couple of older boys stopped by to . “What are you doing?” asked one of the visitors. “We plan to dig a hole all the way through the !” one of the brothers volunteered .
The older boys began to , telling the younger ones that digging a hole all the way through the earth was . After a long silence, one of the picked up a jar full of spiders, worms and many other kinds of insects. He the lid and showed the wonderful to the scoffing（嘲笑的）visitors. Then he said quietly and , “Even if we don’t dig all the way through the earth, look at what we have found the way!”
Their goal was far too ambitious, but it did cause them to dig. And that is a goal is for — to cause us to move in the we have chosen, in other words, to keep us ! But not every goal will be fully . Not every job will end . Not every hope will come to pass. Not every love will last. Not every dream will be . But when you fall of your aim, perhaps you can say, “Yes, but look at what I found along the way! Look at the wonderful things my life because I tried to do something!” It is in the digging life is lived. And I believe it is the joy in the journey, in the end, that truly .
A．rest B．work C．watch D．laugh
A．house B．earth C．wall D．road
A．calmly B．patiently C．excitedly D．impatiently
A．laugh B．think C．stare D．smile
A．important B．difficult C．impossible D．interesting
A．passers-by B．watchers C．visitors D．diggers
A．moved B．removed C．broke D．pushed
A．contents B．scenes C．pictures D．jars
A．properly B．confidently C．carefully D．happily
A．in B．along C．to D．out
A．what B．how C．where D．which
A．way B．direction C．life D．sight
A．thinking B．moving C．digging D．living
A．made B．prepared C．kicked D．achieved
A．hopelessly B．pleasantly C．surprisingly D．successfully
A．come true B．realized C．made D．treasured
A．short B．lost C．out D．behind
A．breaking into B．turning to C．coming into D．holding to
A．when B．where C．which D．that
A．matters B．happens C．appears D．exists
This is the story of two lovers, who finally got married. Both of them were romantic at first, on the walk of life, problems, quarrels, profession came into their life.
One day, she finally decided, “I want to break up.”
“Why?” he asked.
“I am ”She answered.
He kept silent the whole night, seemingly in deep . Finally he asked, “What can I do to
your mind?”
Looking into his eyes she said, “Answer my question. If you can my heart, I will change my mind. Let’s say, I want a flower on the face of a mountain cliff (悬崖), we are both sure that picking the flower will cause your . Will you do it for me?”
He said, “I will give you my tomorrow.”
She woke up the next morning, found him gone, and saw a piece of paper on her bed, which , “My dear, I would not pick that flower for you. The are …”
“When you use the computer you always the software, and you cry in front of the screen. I have to save my fingers so that I can help to the programs. You always leave the house keys behind, so I have to save my to rush home to open the door for you. You love traveling but always lose your way in a (n) city. I have to save my eyes to show you the way. You always at the computer, and that will do nothing good for your eyes. I have to save my eyes when we grow old, I can help to clip your nails and help to remove those white hairs.”
“Thus, my dear, I am sure that there is someone who loves you more than I do … I can not pick that flower yet, and die …”
That’s life, and . Flowers, and romantic moments are only used and appear on the of the relationship. Under all this, the pillar of true love stands.
A．while B．and C．but D．so
A．lonely B．dead C．worn out D．awesome
A．sorrow B．thought C．shade D．anger
A．speak B．change C．blow D．keep
A．represent B．expand C．warm D．convince
A．grown B．planted C．living D．growing
A．injury B．hurt C．wound D．death
A．decision B．answer C．opinion D．choice
A．wrote B．informed C．printed D．went
A．answers B．messages C．reasons D．purposes
A．run out B．put up C．use up D．mess up
A．repair B．restore C．fix D．mend
A．legs B．life C．energy D．strength
A．big B．new C．modern D．strange
A．glance B．look C．glare D．stare
A．as if B．now that C．so that D．in case
A．annoying B．emerging C．rough D．refreshing
A．although B．even if C．unless D．if
A．friction B．love C．couple D．power
A．surface B．way C．course D．nature