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A) still late
B) too late
C) so late
D) past
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The next train to Beijing is ____ to arrive at 9 答案选项:A.m..
A.m..答案选项：A.dueB.sureC.earlyD.late
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My father is a classic music fan.He has bought hundreds of classic music CDs.( ) however, he has changed his taste.He listens to Jazz piano every evening.
A、LatterB、LaterC、LatelyD、Late
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Asystemadministratorincreasesthembufpoolallocation,thenrunsvmstat.Itisnoticedthatthepagingratehasnotdecreased.Whatisthemosteffectiveoptiontomaintainthembufpoolanddecreasepaging?()
A.IncreasethenumberofCPUs.B.Increasethephysicalmemory.C.SetthePSALLOCenvironmentvariableto’late’.D.SetthePSALLOCenvironmentvariableto’early’.
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He got up so late that he missed the school bus．（改为同义句）He got up________ late________ ________the school bus．
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共用题干
Late-Night DrinkingCoffee lovers beware.Having a quick"pick-me-up"cup of coffee late in the day will play havoc with your sleep .As well as being a stimulant,caffeine interrupts the flow of melatonin,the brain hormone that sends people into a sleep.Melatonin levels normally start to rise about two hours before bedtime. Levels then peak be-tween 2 am and 4 am,before falling again."It's the neurohormone that controls our sleep tells our body when to sleep and when to wake,"says Maurice Ohayon of the Stanford Sleep Epidemiology Research Center at Stanford University in California.But researchers in Israel have found that caf feinated coffee halves the body's levels of this sleep hormone.Lotan Shilo and a team at the Sapir Medical Center in Tel Aviv University found that six vol-unteers slept less well after a cup of caffeinated coffee than after drinking the same amount of de-caf. On average,subjects slept 336 minutes per night after drinking caffeinated coffee,compared with 415 minutes after decaf. They also took half an hour to drop offtwice as long as usual-and jigged around in bed twice as much.In the second phase of the experiment,the researchers woke the volunteers every three hours and asked them to give a urine sample.Shilo measured concentrations of a breakdown product of melatonin .The results suggest that melatonin concentrations in caffeine drinkers were half those in decaf drinkers .In a paper accepted for publication in Sleep Medicine,the researchers suggest that caffeine blocks production of the enzyme that drives melatonin production.Because it can take many hours to eliminate caffeine from the body,Ohayon recommends that coffee lovers switch to decaf after lunch. The author of this passage probably agrees that______.A: coffee lovers sleep less than those who do not drink coffeeB: we should not drink coffee after supperC: people sleep more soundly at midnight than at 3 a.m.D: if we feel sleepy at night,we should go to bed immediately
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向量的索引 （1）使用salary_A和salary_B分别打印出A在周三的收入、B在周五的收入。 （2）选出A在周二、周三、周四的收入，存入向量A_midweek （3）使用冒号:选出A在周二到周五的收入，存入向量A_late
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