"Earthquake!"The word flashed in my brain.A roaring sound filled my ears.I tried to slide beneath my desk.The desk did a wild tap dance,slipping and sliding towards the centre of the room.I twisted my body and grabbed at the windowsill behind me,somehow kicking free of my dancing chair.I tried to stand.My legs skated away as if on a bucking escalator. My fingers shook,grasped and held the windowsill tightly.Somewhere through the roar sounded the terrified scream of some wounded animal.I looked behind me and tried to steady my gaze on the other kids but the scene was a dizzy nightmare.Some of the class were sitting in the middle of the room,surrounded by chairs and desks.One girl was screaming.A boy was trying to claw his way across the floor to the door in a crazy overarm crawl. My grip froze me to the windowsill. I cried aloud,"I'm going to die.I'm going to die.Save me,I'm not ready to die,I'm not ready!" I hunched forward on my knees and pressed my face against my clenched fingers.I looked at the backs of my fingers and stupidly noticed the fragile pale hairs growing out of the pores.The fingers would soon cease to exist.Somehow the impending horror of my death was too terrible to even cry about. Suddenly,I became aware that the rocking had ceased.Perhaps I wasn't going to die. The roaring sound was made by _ . A) a wounded animal B) people screaming C) children running D) an earthquake
D
Humans have observed and explored the oceans since ancient times.But it wasn't until the 19th century that the scientific study of oceans began.The first major scientific expedition,and the one that firmly established the field of oceanography,was the around-the-world voyage of H.M.S. Challenger.Setting out from England in 1872,the Challenger spent almost three and a half years gathering a wealth of information about seawater,sea life,and the ocean floor.Major oceanographic expeditions since then have included the South Atlantic voyage of the German ship Meteor in 1926 and the Deep-Sea Drilling Project from 1968 to 1983.Many individuals also have played important roles in advancing our understanding of oceans,beginning with Matthew Fontaine Maury in the mid-1800s;his work on oceanography and navigation led to a uniform system of weather reporting at sea.Since Maury's time,oceanography has progressed rapidly.Early oceanographers had to contend themselves with tossing buckets overboard to see what they might haul in.Today's oceanographers are equipped with space images,supercomputer models,and deep-sea robots that can crawl along the seafloor.As they set goals for the future,some oceanographers even dream of doing research in permanently manned stations on the bottom of the oceans. Which of the following statements is true? A) Humans didn't explore the oceans until the 19th century. B) Maury first established the field of oceanography. C) Maury spent a lot of time in studying seawater,sea life,and the bottom of the ocean. D) Many individuals also plays a very important part in advancing our understanding of oceans,such as Maury.
D
Q: When prehistoric man arrived in new parts of the world, something strong happened to the large animals; they suddenly became extinct. Smaller species survived; the large, slow-growing animals were easy game, and were quickly hunted to extinction. Now something similar could be happening in the oceans. That the seas are being over-fished has been known for years and researchers such as Ransom Myers and Boris Worm have shown how fast things are changing. They have looked at half a century of data from fisheries around the world. Their methods do not attempt to estimate the actual biomass (the amount of living biological matter) of fish species in particular parts of the ocean, but rather changes in that biomass over time. According to their latest paper published in Nature, the biomass of large predators (animals that kill and eat other animals) inanes fishery is reduced on average by 80% within 15 years of the start of exploitation. In some long-fished areas, it has halved again since then. Dr. Worm acknowledges that these figures are conservative . One reason for this is that fishing technology has improved. Today's vessels can find their prey using satellites and sonar, which were not available 50 years ago. That means a higher proportion of what is in the sea is being caught, so the real difference between present and past is likely to be worse than the one recorded by changes in catch sizes. In the early days, too, longlines would have been more saturated with fish. Some individuals would therefore not have been caught, since baited hooks would have been available to trap them, leading to an underestimate of fish stocks in the past. Furthermore, in the early days of longline fishing, a lot of fish were lost to sharks after they had been hooked. That is no longer a problem, because there are fewer sharks around noise. Dr. Myers and Dr. Worm argue that their work gives a correct baseline, which future management efforts must take into account. They believe the date support an idea current among marine... We can infer from Dr Myers and Dr. Worm's paper that _ . A) the stock of large predators in some old fisheries has reduced by 90% B) there are only half as many fisheries are there were 15 years ago C) the catch sizes in new fisheries are only 20% of the original amount D) the number of larger predators dropped faster in new fisheries than in the old
A: A
Of the 7,000 languages spoken in the world today, linguists say, nearly half are likely to disappear this century. In fact, one falls out of use about every two weeks. Some languages die out in an instant, at the death of the only surviving speaker. Others are lost gradually in bilingual cultures, as local tongues are edged out by the dominant language at school, in the marketplace and on television. New research, supported by the National Geographic Society and the Living Tongues Institute for Endangered Languages, has found the five regions where languages are disappearing most rapidly. They are northern Australia, central South America, North America's upper Pacific coastal zone, eastern Siberia, and Oklahoma and the southwestern United States. K. David Harrison, an associate professor of linguistics at Swarthmore College, US, said that more than half the languages had no written form and were _ to loss and being forgotten." Their loss leaves no dictionary, no text, or no record of the accumulated knowledge and history of a disappeared culture. Harrison and other researchers started their rescue project last year. They have been trying to identify and record endangered languages. They interviewed and made recordings of the few remaining speakers of a language and collected basic word lists. The individual projects, some lasting three to four years, involve hundreds of hours of recording speech, developing grammar and preparing children's readers in the obscure language. The research has concentrated on preserving entire language families. "These are probably languages that cannot be brought back, but at least we made records of them," said Gregory Anderson, director of the Living Tongues Institute, in Oregon, US. What do you think is the suggested reason for some languages disappearing? A) Local tongues are gradually edged out by the dominant language at school, in the marketplace and on television. B) The number of people who speak the languages are small. C) There are no dictionaries for the languages. D) No one make records of the languages, so they gradually disappear.
A