r than when they went to sleep。
The team； therefore； concluded that the nerve connections involved in memory are reinforced through reactivation during REM sleep； particularly if the brain detects an inherent structure in the material being learnt。 So now； on the eve of that crucial test； maths students can sleep soundly in the knowledge that what they will remember the next day are the basic rules of algebra and not the incoherent talk from the radio next door。
26。Researchers in behavioral psychology are divided with regard to
＇A＇ how dreams are modified in their courses。 ＇B＇ the difference between sleep and wakefulness。
＇C＇ why sleep is of great benefit to memory。 ＇D＇ the functions of a good night’s sleep。
27。As manifested in the experimental study； rapid eye movement is characterized by
＇A＇ intensely active brainwave traces。 ＇B＇ subjects’ quicker response times。
＇C＇ complicated memory patterns。 ＇D＇ revival of events in the previous day。
28。By referring to the artificial grammar； the author intends to show
＇A＇ its significance in the study。 ＇B＇ an inherent pattern being learnt。
＇C＇ its resemblance to the lights。 ＇D＇ the importance of night’s sleep。
29。In their study； researchers led by Pierre Maquet took advantage of the technique of
＇A＇ exposing a long…held folk wisdom。 ＇B＇ clarifying the predictions on dreams。
＇C＇ making contrasts and comparisons。 ＇D＇ correlating effects with their causes。
30。What advice might Maquet give to those who have a crucial test the next day？
＇A＇ Memorizing grammar with great efforts。 ＇B＇ Study textbooks with close attention。
＇C＇ Have their brain images recorded。 ＇D＇ Enjoy their sleep at night soundly。
Text 3
This line of inquiry did not begin until earlier this month — more than three months after the accident — because there were “too many emotions； too many egos；” said retired Adm。 Harold Gehman； chairman of the Columbia Accident Investigation Board。
Testifying before the Senate Commerce Committee； Gehman said this part of his inquiry was in its earliest stages； starting just 10 days ago。 But Gehman said he already has concluded it is “inconceivable” that NASA would have been unable or unwilling to attempt a rescue for astronauts in orbit if senior shuttle managers and administrators had known there was fatal damage to Columbia’s left wing。
Gehman told reporters after the hearing that answers to these important questions could have enormous impact； since they could place in a different context NASA’s decisions against more aggressively checking possible wing damage in the days before Columbia’s fatal return。
Investigators believe breakaway insulating foam damaged part of Columbia’s wing shortly after liftoff； allowing superheated air to penetrate the wing during its fiery reentry on Feb。1； melt it from inside。
Among those decisions was the choice by NASA’s senior shuttle managers and administrators to reject offers of satellite images of possible damage to Columbia’s left wing before the accident。 The subject dominated the early part of Wednesday’s hearing。
Gehman complained managers and administrators “missed signals” when they rejected those offers for images； a pointedly harsh assessment of the space agency’s inaction during the 16…day shuttle mission。
“We will attempt to pin this issue down in our report； but there were a number of bureaucratic and administrative missed signals here；” Gehman told senators。 “We’re not quite so happy with the process。”
The investigative board already had recommended that NASA push for better coordination between the space agency and military offices in charge of satellites and telescopes。 The U。S。 National Imagery and Mapping Agency in March agreed to regularly capture detailed satellite images of space shuttles in orbit。
Still； Gehman said it was unclear whether even images from America’s most sophisticated spy satellites might have detected on Columbia’s wing any damage； which Gehman said could have been as small as two inches square。 The precise capabilities of such satellites proved to be a sensitive topic during the Senate hearing。
31。This text is most probably taken from an article entitled “ ”。
＇A＇ Gehman’s Comments on Columbia Accident。
＇B＇ An Inquiry into Columbia Accident。
＇C＇ Shedding Light on Shuttle’s Safety。＇D＇ NASA’s Problems Being Exposed。
32。The word “they” in the sentence “since they could place” （Para。3） denotes
＇A＇ “damages”。 ＇B＇ “answers”。 ＇C＇ “decisions”。 ＇D＇ “questions”。
33。According to the writer； what may chiefly be responsible for the Columbia accident？
＇A＇ A supposed damage to the left wing of the spacecraft。
＇B＇ The deliberate rejection of satellite images。
＇C＇ A sense of sentiment and arrogance involved。
＇D＇ The space agency’s inaction during its mission。
34。As mentioned in the text； the Wednesday’s hearing revolved around
＇A＇ the precise capabilities of spy satellites in orbit。
＇B＇ NASA’s indecisions against checking upon the Columbia。
＇C＇ NASA’s rejection of satellite images offered。
＇D＇ the coordination between NASA and military offices。
35。Which of the following can best describe Gehman’s attitude towards satellite images？
＇A＇ Apprehensive。 ＇B＇ Credulous。 ＇C＇ Indifferent。 ＇D＇ Cautious。
Text 4
When a disease of epidemic proportions rips into the populace； scientists immediately get to work； trying to locate the source of the affliction and find ways to combat it。 Oftentimes； success is achieved； as medical science is able to isolate the parasite； germ or cell that causes the problem and finds ways to effectively kill or contain it。 In the most serious of cases； in which the entire population of a region or country may be at grave risk； it is deemed necessary to protect the entire population through vaccination； so as to safeguard lives and ensure that the disease will not spread。
The process of vaccination allows the patient’s body to develop immunity to the virus or disease so that； if it is encountered； one can ward it off naturally。 To accomplish this； a small weak or dead strain of the disease is actually injected into the patient in a controlled environment； so that his body’s immune system can learn to fight the invader properly。 Information on how to penetrate the disease’s defenses is transmitted to all elements of the patient’s immune system in a process that occurs naturally； in which genetic information is passed from cell to cell。 This makes sure that； should the patient later come into contact with the real problem； his body is well equipped and trained to deal with it； having already done so before。
There are dangers inherent in the process； however。 On occasion； even the weakened version of the disease contained in the vaccine proves too much for the body to handle； resulting in the immune system succumbing； and； therefore； the