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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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A recent ________ was that about 20 per cent of college graduates joined the army of the unemployed last year.
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A. The car is running out of gasoline.B：We'd better fill it up.以上对话是发生在以下哪种语境中_____。
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He has an excellent job, with an amazing car! He even owns his own flat in the City. So he's a bit of a high-flyer. So he is____.
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It was getting dark; I found a car _____ in a pool by the side of the road.
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Some of the fans chased after the singer’s car to catch a _______ of her.
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A great deal of research___into the possible causes of cancer in recent years.
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“The old car sputtered to the top of the hill; we were all relieved” is a simple sentence.
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In recent years a number of schools __________ in the remote western regions.
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A major recent conceptual shift between the DSM-IV and the DSM-V is that the diagnosis of mental disorders is now regarded more as a ______________ and less of a ______________.
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99. At a spot where the charted depth is 15 m, and the tidal height is -1.3 m, then the actual depth of the water is ____
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There has been a collision ______ a number of cars on the main road to town.
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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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M: Hi, what have you been _____1_____ recently W: Study. You know, the exam is coming
M: Hi, what have you been _____1_____ recently W: Study. You know, the exam is coming in two weeks. M: Exam What exam W: Oh, you don’t know. It’s for a certificate in _____2_____. M: Great. Those skills are necessary and widely used. W: Right. Plus, I want to learn something ______3______ my major. M: That’s good. It’s better to ______4______ ourselves with multiple skills, which are what employers ______5______. W: Agree. That’s why I’ve been teaching myself new things.
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According to the recent survey, growth of facility investment tends to fall_____ there is a presidential election.
A．which
B．in order that
C．on behalf of
D．when
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He is one of the growing number of Americans who in recent years have ______ dangerous sports to fill their leisure time.
A.taken off
B.taken up
C.taken in
D.taken over
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The price of the car "Honda" is very_____and my parents can't afford it.
A．cheap
B．high
C．expensive
D．dear
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Boil 0.5 g of thepowdered tablets for 2 to 3 minutes with 10 mL of 5 M sodium hydroxide, cooland add an excess of 1 M sulfuric acid; a crystalline precipitate is produced.To a solution of the precipitate in water add iron (III) chloride solution R1;a _______ colour is produced.
A、turquoiseblue
B、deep violet
C、sandy brown
D、smoky grey
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Where do cars get their energy from？ For most cars, the answer is petrol. 1_____some cars use electricity. These cars have 2 _____motors that get their power from large batteries. In 3___, there are even cars that have 4_____ an electric motor and a petrol motor. These types of cars are 5_____ hybrid (混合) cars.
Most people tend to think of electric cars as a new 6 ____, but they have been around for a long time. In the 7_____ 19th and early 20th centuries electric cars were common because the technology for petrol engines was not very advanced.But 8____ the petrol engine became easier to make and more powerful, this type of engines became the most 9 ____.Interest in electric cars was high in the l970s and 1980s because 10____ became very expensive.Recently, electric cars have again become well-liked because people want cars that pollute 11_____.
Electric cars are better than petrol cars 12______ several ways. The biggest benefit is reduced pollution.In areas 13_____ there is a high percentage of electric cars, pollution is not that serious. The second benefit of electric cars is a 14 _____in the dependence on foreign oil.Several countries don’t want to 15 _____on oil from other countries. Since electric cars can run on electricity from coal or nuclear power stations, there is less need to import oil.
(15分)
(1)第1题最佳答案应选()(1分)
A. But
B. Nor
C. Or
D. And
(2)第2题最佳答案应选()(1分)
A. traditional
B. common
C. same
D. special
(3)第3题最佳答案应选()(1分)
A. summary
B. detail
C. time
D. addition
(4)第4题最佳答案应选()(1分)
A. all
B. both
C. either
D. neither
(5)第5题最佳答案应选()(1分)
A. described
B. regarded
C. called
D. known
(6)第6题最佳答案应选()(1分)
A. invention
B. influence
C. instrument
D. intention
(7)第7题最佳答案应选()(1分)
A. last
B. beginning
C. recent
D. late
(8)第8题最佳答案应选()(1分)
A. unless
B. after
C. before
D. until
(9)第9题最佳答案应选()(1分)
A. popular
B. comfortable
C. difficult
D. dangerous
(10)第10题最佳答案应选()(1分)
A. motors
B. power
C. cars
D. oil
(11)第11题最佳答案应选()(1分)
A. much
B. more
C. less
D. few
(12)第12题最佳答案应选()(1分)
A. by
B. in
C. at
D. on
(13)第13题最佳答案应选()(1分)
A. when
B. where
C. what
D. which
(14)第14题最佳答案应选()(1分)
A. start
B. need
C. reduction
D. rise
(15)第15题最佳答案应选()(1分)
A. put
B. hold
C. rely
D. keep
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The speculatior raised by Pertti Peussa is based on a function of the in-car computer that prevents the car exceeding certain speeds when ________.
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One of the measures to keep a car within the speed limit is______.
A．to add less fuel to the engine
B．to limit the use of accelerator
C．to push down the accelerator pedal
D．to remove the pedal from accelerator
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Recently the car factory had to carry out personnel________because of financial trouble.
A．cuts
B．demands
C．reductions
D．orders
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The gate is too_____for a car to pass through.
A．wide
B．high
C．narrow
D．neat
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The cab of a British car is on the left.（)
是
否
