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Network equipment supporting the use of flow control mechanisms has been recently installed. What is the purpose of flow control in a data network?（）
A . It ensures that data is retransmitted if an acknowledgment is not received.
B . It reassembles segments in the correct order on the destination device.
C . It provides a mechanism for the receiver to control the transmission speed.
D . It regulates the size of each datagram segment.
E . All of the above are functions of flow control
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There has been a positive response to the export promotion（）？
A . hasn’t it
B . hasn’t there
C . doesn’t it
D . has there
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There has been a collision in sea area of Fork.（）.
A . Stand by to give assistance
B . Stand by to alter course
C . Stand by to stop engine
D . Stand by to go aster
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There has been a great increase in retail sales , （）﹖
A . does there
B . isn't there
C . hasn't there
D . isn't it
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Mr. Green has recently been ______ to director of the president's office.
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There has not been a great response to the slate, _________?
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There has been a __________ (reduce) in the amount of steel imported toBritainin 2016.
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There has been a ______ in fashion from formal to more informal dress.
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There has been ____ growth in the popularity of social media.
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2.What disturbs investors is the fact that themarket has been fluctuating(波动) irrationally(非理性地 recently.( )
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what has luca been learning recently
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Mrs. Johnson has been sick recently.
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Recently more and more attention has been _.
A、focused
B、focuse
C、focusing
D、foucusion
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听力原文：M: Oh, it's you, Mrs. Bramley. Come in and sit down. Now, what was it？ Oh, yes, your ankle. Has .there been any improvement since last week？
W: Well, no, I'm afraid not, doctor. The leg's still the same.
M: I'd better have another look at it. HM! It's still very swollen. Have you been resting it, as! told you to？
W: It's so difficult to rest it, doctor, you know, with a house to run, and six children to look after.
M: Well, I've given you my advise. I'm sorry, but rest is necessary, otherwise I wouldn't have insisted on it. You must sit for at least four hours a day with the leg raised. Otherwise the ankle isn't going to improve. You understand that？
W: Yes, I understand, and I'll try to do as you say.
M: Very well then. I'll repeat that prescription for tablets, but the only effective treatment is rest. Ask the next patient to come in please.
What's wrong with the woman？
A．She needs to take more exercise.
B．Her uncle's health has not improved.
C．She can't understand the doctor.
D．Her ankle is swollen.
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听力原文：M: Hi, honey. I'm stuck in traffic. There has apparently been a big accident up ahead. We are just not moving.
W: That's too bad. Where are you？
M: I'm on the Garden City expressway near the sport stadium. I was on my way to drop off some samples at a new client's office and then I was going to pick up Billy from kindergarten. But now I'm afraid I won't be able to get there on time. Is there any chance you could get away early？
W: Should be fine.
What are the speakers mainly discussing？
A．A problem caused by traffic jam
B．The time to meet a new client
C．The place to drop off the samples
D．The way to get to the kindergarten
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Is there something as truth？ For a good many centuries "the search for truth" has been （31
Is there something as truth？ For a good many centuries "the search for truth" has been (31) the noblest activity of the human mind, but the seekers after truth have come to such (32) conclusions that it often seems that very little progress has been made. (33) , there are many people who reel that we are actually going backward. They (34) , often contemptuously, that we have accumulated more "knowledge" than our ancestors, but they think we are farther from the truth than ever, or even that we have (35) the truth that we once possessed. If people look for anything long enough without finding it, the question naturally arises (36) the thing is really there to find. You have seen a picture of an animal with a lion's head, a goat's body, and a serpent's tail--and maybe an eagle's wings for good (37) There is plenty of evidence that each part of this animal (38) --but there is no (39) evidence that the parts ever occur in this combination. It is at least conceivable that the seekers after "truth" have made a similar mistake and invented an (40) combination.A.regardedB.consideredC.ponderedD.referred
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The disease is w______ in America and quite recently there have been reports of cases in dogs in the UK.
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There has been a great increase in retail sales, ______？
A．does there
B．hasn't there
C．isn't there
D．isn't it
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There has been a collision ___ a number ？
There has been a collision ___ a number of cars on the main road to town.
<span style="font-weight:bold">A) composing B) consisting C) involving D)engaging</span>
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The emergency department nurse is caring for a client who has recently been prescribed methadone for chronic severe back pain. The client ingested extra tablets tonight because the pain returned. Whic
A．Client？falls？asleep？while？the？nurse？is？talking
B．Client？frequently？scratches？due？to？pruritus
C．Client？has？third？emesis？since？taking？medication
D．Monitor？reveals？one？premature？ventricular？contraction
E．Pulse？oximeter？shows？oxygen？saturation？is？90%
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In the past decade there has been a big 查看材料
A.the carelessness of the drivers
B.increase in the number of ears stolen
C.non-professional thieves
D.lack of parking space
E.safe parking spots
F.professional thieves
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China's economy has recently been expanding at better than a 10 percent monthly pace.
A．Y
B．N
C．NG
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An office has been set up recently to examine the tourism industry.（)
是
否
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The old house is in perfect conditions because it has recently been renovated（）
A．destroyed
B．damaged
C．restored
D．decayed
