A: For years some people have been saying that railways are dead. They say, “Trains are slow, and they lose money. Motorcars and planes have made them unnecessary.”

B:    1.   . I think in these days of expensive oil, railways have become highly competitive with motorcars and planes.

A: Right. If you want to carry people or goods from place to place, they are much cheaper than planes.

B:    2.   . A plane goes in a straight line, and so does a railway.

A: What is more, it takes you from the heart of a city into the heart of another.    3.   . Nor does it hold you up as a car does in heavy traffic.

B:    4.   . Modern railway lines give you a smooth, untroubled journey. We’ve just entered the age of super-fast trains, traveling at 160 miles an hour and more.

A：5.

A. So railways will have very bright future, I dare say. 

B. It doesn’t leave you as a plane does, miles and miles from the city center.

C. Far from being dead, railways are developing very quickly.

D. Trains are really slower than planes. 

E. And they have much in common with planes.

F. But it is far from the truth. 

G. Trains are really more comfortable than planes.

 

A

For most pregnant women, exercise is the last thing on their minds. After all, keeping slim while you’re expecting isn’t exactly the top priority— rather, it’s making sure your baby gets enough nutrients to grow. But in a small new study, researchers at the University of Auckland in New Zealand report that a mother’s regular aerobic exercise may be good for a growing fetus’ health — and may even help a baby get a healthier start in life.

The finding is a bit surprising, because exercise is known to lower the risk of insulin resistance（胰岛素抵抗），a condition eventually leading to diabetes（糖尿病）. Although insulin resistance is a detriment in healthy adults, it turns out to be helpful for proper fetal（胎儿）development. In pregnant women, this condition means nutrients get shunted to the growing baby.

The question is: could a mother’s exercise put her developing baby’s food supply at risk? Past studies looking at the effect of exercise on birth weight have been inconclusive, and none have really investigated the influence of exercise on the mother’s sensitivity to insulin. So the University of Auckland’s Dr. Paul Hoffman and his team decided to study 84 first-time mothers, who were of normal weight on average, and track any effects aerobic exercise(有氧运动) might have on their insulin sensitivity and, ultimately, on their babies’ birth weight. Researchers asked some women to exercise on a stationary bicycle for at least 40 minutes per session, up to five times each week, starting in the 20th week of pregnancy; the other women were not specifically asked to exercise. When the two groups and their babies were compared, the team found that women who bicycled regularly gave birth to babies who were on average 150g lighter than those born to the non-exercising mothers. In both groups, however, the babies were of healthy weight, and there was no difference in the mothers’ weights.

Generally speaking, babies on the lower end of the normal weight range are considered healthier and less prone to developing diabetes and obesity than heavier ones, so this was an encouraging result. Even more reassuring was that regular exercise did not seem to affect the flow of nutrients to the growing babies in the womb.

41. According to the new study, a pregnant woman’s regular exercise may _______.

  A. bring benefits to a baby’s growth

  B. lower the risk of insulin resistance

  C. put her baby’s food supply at risk

  D. help her keep slim and healthy

42. What does the underlined word “detriment” mean in the second paragraph?

  A. Something that brings good.

  B. Something that brings damage.

  C. Something that brings obstacles.

  D. Something that brings development.

43. What is the purpose of the experiment carried out by Dr. Paul Hoffman?

  A. To investigate the influence of exercise on pregnant women.

  B. To find out what aerobic exercise can benefit a baby’s growth.

  C. To make sure of the effects exercise may have on babies’ birth weight

  D. To compare the differences between mothers who exercise and who don’t

44. Which of the following statements is true according to the passage?

  A. Lighter babies are generally believed to be healthier than heavier ones.

  B. Non­－exercising mothers will definitely give birth to heavier babies.

  C. No studies have looked at the effect of exercise on birth weight before.

  D. Some women studied were asked to exercise regularly while some don’t.

45. Which of the following may be the best title for the passage?

  A. All mothers should take aerobic exercise.

  B. Moms who exercise give birth to lighter babies。

  C. Exercise reduces the risk of insulin resistance.

  D. Heavier babies are more likely to develop diabetes.

A black hole is created when a large star burns out. Like our sun, stars are unbelievably hot furnaces (熔炉) that burn their own matter as fuel. When most of the fuel is used up, the star begins to die.

The death of a star is not a quiet event. First there is a huge explosion. As its outer layer is blasted off into space, the dying star shines as brightly as a billion suns.

After the explosion gravity pulls in what’s left of the star. As the outside of the star sinks toward the center, the star gets smaller and smaller. The material the star is made of becomes tightly packed together. A star is so dense that a teaspoon of matter from it weighs billion of pounds.

The more the star shrinks, the stronger the gravity inside it becomes. Soon the star is very tiny, and the gravity pulling it in is unbelievably strong. In fact, the gravity is so strong that it even pulls light into the star! Since all the light is pulled in, none can go out. The star becomes black when there is no light. Then a black hole is born!

That’s what we know about black holes. What we don’t know is this: What happens inside a black hole after the star has been squeezed into a tiny ball? Does it keep getting smaller and smaller forever? Such a possibility is hard to imagine.

But if the black hole doesn’t keep shrinking, what happens to it? Some scientists think black holes are like doorways to another world. They say that as the star disappears from our universe, it goes into another universe. In other words a black hole in our universe could turn into a “white hole” in a different universe. As the black hole swallows light, the white hole shines brightly—somewhere else. But where? A different place, perhaps, or a different time — many years in the past or future.

Could you travel through a black hole? Right now, no. Nothing we know of could go into a black hole without being crushed. So far the time being, black hole must remain a mystery.

Black holes are a mystery—but that hasn’t stopped scientists from dreaming about them. One scientist suggested that in the future we might make use of the power of black holes. They would supply all of Earth’s energy needs, with plenty to spare. Another scientist wondered if a black hole could some day be used to swallow earthly waste—a sort of huge waste disposal(处理) in the sky!

When the star begins to die ______.

A. there is no fuel left in it                                B. its outer layer goes into space first

C. a huge explosion will happen                         D. it doesn’t give off light any longer

Which of the following doesn’t help produce a black hole?

A. The gravity inside the star is very strong.        B. The light can’t go out of the star.

C. The star becomes smaller and smaller             D. The dying star shines very brightly.

The black hole ______.

A. continues becoming smaller and smaller all the time

B. goes into another universe and becomes a white hole

C. can pull in everything we know of in the world

D. will appear at another place at a different time

What’s the best title for this passage?

A. A New Scientific Discovery: Black Holes

B. How Do Black Holes Come Into Being?

C. What Are Black Holes?

D. Travel Through A Black Hole

A gentle breeze blew through Jennifer's hair. The golden red sun was setting. She was on the beach, looking up at the fiery (火红的) ball. She was amazed by its color, deep red in the middle, softly fading into yellow. She could hear nothing but the waves and the seagulls flying up above in the sky.    

The atmosphere relaxed her. After all she had been through, this was what she needed. "It's getting late," she thought, "I must go home. My parents will be wondering where I am."

She wondered how her parents would react, when she got home after the three days she was missing. She kept on walking, directing herself where she spent every summer holiday. The road was deserted. She walked slowly and silently. Just in a few hundred meters she would have been safe in her house.

It was really getting dark now. The sun had set a few minutes before and it was getting cold too. She wished she had her favorite sweater on: it kept her really warm. She imagined having it with her. This thought disappeared when she finally saw her front door. It seemed different. Nobody had taken care of the outside garden for a few days. She was shocked: her father was usually so strict about keeping everything clean and tidy, and now... It all seemed deserted. She couldn't understand what was going on.    

She entered the house. First, she went into the kitchen where she saw a note written by her father. It said: "Dear Ellen, there is some coffee ready. I went looking." Ellen was her mother but－where was she? On the right side of the hallway was her parents' room. She went in. Then she saw her. Her mother, lying on the bed, was sleeping. Her face looked so tired, as if she hadn't slept for days. She was really pale. Jennifer would have wanted to wake her up but she looked too tired. So Jennifer just fell asleep beside her. When Jennifer woke up, something was different－she wasn't in her mother's room and she wasn't wearing the old clothes she ran away in. She was in her cozy bed in her pajamas.     

It felt so good being back home. Suddenly she heard a voice, "Are you feeling better now, dear? You know you got us very, very scared."

Three days later Jennifer came back home      .

A. at sunrise         B. at sunset      C. at night              D. at midday

What does the underlined phrase "This thought" most probably mean?

A. The idea of going back home.           

B. Her anxiety about her parents.     

C. The feeling of being warm in her favorite sweater.     

D. The feeling of getting back home safely.

Her father didn't take care of the garden because      .

A. he was busy looking for her   

B. he had to look after his wife

C. he was not strict with his job        

D. he no longer enjoyed working in the garden

What can we infer from this passage?

A. In fact Jennifer's mother had been sick for days.     

B. As Jennifer walked towards home, she became increasingly scared.     

C. When she found the garden deserted, she realized she was wrong.     

D. Having experienced a lot outside, Jennifer felt home was safest for her.

A woman renewing her driver’s license at the County Clerk’s office was asked to state her occupation．She hesitated, uncertain how to classify herself．

“What I mean is,” explained the recorder, “do you have a job, or are you just a …”

“Of course I have a job,” said Emily．“I’m a mother.”

“We don’t list ‘mother’ as an occupation… ‘housewife’ covers it,” said the recorder.

       One day I found myself in the same situation．The clerk was obviously a career woman, confident and possessed of a high sounding title．“What is your occupation?” she asked．

       The words simply popped out．“I’m a Research Associate in the field of Child Development and Human Relations.”

       The clerk paused, ballpoint pen frozen in midair.

       I repeated the title slowly, and then I stared with wonder as my statement was written in bold, black ink on the official questionnaire.

       “Might I ask,” said the clerk with new interest, “Just what you do in this field?”

       Coolly, without any trace of panic in my voice, I heard myself reply, “I have a continuing program of research (what mother doesn’t）, in the lab and in the field (normally I would have said indoors and out)．Of course, the job is one of the most demanding in the humanities (any mother care to disagree?), and I often work 14 hours a day (24 is more like it)．But the job is more challenging than most careers and rewards are more of a satisfaction rather than just money.”

       There was an increasing note of respect in the clerk’s voice as she completed the form, stood up, and showed me out．

       As I drove into our driveway, buoyed up (依托) by my glamorous new career, I was greeted by my lab assistants---ages 13, 7, and 3.

       Upstairs I could hear our new experimental model (a 6 month old baby), in the child-development program, testing out a new vocal pattern．

       I felt proud! I had gone on the official records as someone more distinguished and indispensable (不可缺少的) to mankind than “just another mother.”

       Motherhood…What a glorious career! Especially when there’s a title on the door.

What can we infer from the conversation between the woman and the recorder at the beginning of the passage?

       A．The woman felt ashamed to admit what her job was.

       B．The recorder was impatient and rude.

       C．The author was upset about the situation that mothers faced.

       D．Motherhood was not recognized and respected as a job by society.

How did the female clerk feel at first when the author told her occupation?

       A．curious        B．indifferent    C．puzzled             D．interested

How did the author feel when describing her job to the clerk?

     A．calm     B．panic-stricken      C．confident      D．cool

Why did the woman clerk show more respect for the author?

       A．Because the author cared little about rewards.

       B．Because she admired the author’s research work in the lab.

       C．Because she thought the author did admirable work.

       D．Because the writer did something she had little knowledge of.

What is the author’s purpose of writing the passage?

       A．To show how you describe your job affects your feelings toward it.

       B．To argue that motherhood is a worthy career and deserves respect.

       C．To show that the author had a grander job than Emily.

       D．To show that being a mother is hard and boring work．