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（请给出正确答案）
A.Six
B.Two
C.Four
D.Five
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更多“What does the prefix “Penta－” mean？A.SixB.TwoC.FourD.Five”相关的问题
Which of the following does not contain a prefix of numbers？
A.Automobile
B.Decade
C.Trilingual
D.Bilateral
A、“Across”.
B、“Beyond”.
C、“Lack of”.
D、“Someone or something moves from one group, thing, state, or place to another”.
TEXT B
The prefix Mach is used to describe supersonic speed. It was named for Ernst Mach(1838-1916), a Czech-born Austrian physicist, who contributed to the study of sound. When twice the speed of sound, it is Mach 2. When it is near but below the speed of sound, its speed can be designated at less than Mach 1, for example, Mach 0. 90. Mach is defined as" the ratio of the velocity of a rocket or a jet to the velocity of sound in the medium being considered. "
When a plane passes the sound barrier ---- flying faster than sound travels, listeners in the area hear thunderclaps, but the pilot of the plane does not hear them. Sound is produced by vibrations of an object and is transmitted by alternate increase and decrease in pressure that radiate outward through a material media of molecules ---- some what like waves spreading out on a pond after a rock has been tossed into it.
The frequency of sound is determined by the number of times the vibrating waves undulate per second and is measured in cycles per second. The slower the cycle of waves, the lower the frequency. As frequencies increase, the sound is higher in pitch.
Sound is audible to human beings only if the frequency falls within a certain range. The human ear is usually not sensitive to frequencies of fewer than 20 vibrations per second, or more than about 20, 000 vibrations per second --- although this range varies among individuals. Anything at a pitch higher than the human ear can hear is termed ultrasonic.
Intensity, or loudness, is the strength of the pressure of these radiating waves and is measured in decibels. The human ear responds to intensity in a range from zero to 120 decibels. Any sound with pressure over 120 decibels is painful to the human ear.
The speed of sound is generally placed at 1088 feet per second at sea level at 32 degrees Fahrenheit. It varies in other temperatures and in different media. Sound travels faster in water than in air, and even faster in iron and steel. It travels a mile in 5 seconds in air, it does a mile under water in 1 second, and it travels through iron in 1/3 second. It travels through ice cold vapor at approximately 4,708 feet per second; ice-cold water, 4,938; granite, 12,960; hardwood, 12,620; brick, 11,960, glass, 16,410 to 19,690; silver, 8,658; gold, 5,717.
According to this passage, “Mach” refers to
[A] the ratio of the air speed of an aircraft to the speed of sound.
[B] a machine.
[C] a Czech-born Australian physicist.
[D] the pilot of the plane.
A. OSPF area ID
B. prefix list
C. port
D. time-to-live (TTL)
A. a list of prefixes that can be configured in a poilcy
B. a single prefix that is configured separately and be referenced in a policy
C. a list of prefixes that is configured separately and can be referenced in a policy
D. a single prefix that can be configured within a policy
How Should You Build up Your Vocabulary
Exactly what do you do during a normal day？ How do you spend your time？ Paul T. Rankin very much wanted an answer to that question. To get it, he asked sixty-eight individuals to keep an accurate, detailed record of what they did every minute of their waking hours. When he consolidated (巩固) his findings, he discovered that the average individual spent 70 percent of his waking time doing one thing only--communication. That meant either reading, writing, speaking or listening.
Put that evidence alongside of the research findings uncovered by the Human Engineering Laboratories. In exploring aptitudes and careers involving, among other things, data from 30,000 vocabulary tests given yearly, they discovered that big incomes and big vocabularies go together. Vocabulary, more than any other factor yet known, predicts financial success.
And it all fits. Each word you add to your vocabulary makes you a better reader, writer, speaker and listener. Furthermore, linguistic scientists are quick to point out that we actually think with words. If that is so, new words make us better thinkers as well as communicators. No wonder more words are likely to mean more money. What better reason for beginning right now to extend your vocabulary？
Take reading. What exactly do you read？ Common sense says you read words. Research confirms that fact. "Vocabulary in context" contributes 39 percent to comprehension. That' s more than any other factor isolated and studied--even more than intelligence. And "word discrimination" contributes more to speed of reading than any other factor--28 percent. In short, your efforts to improve vocabulary will pay off in both comprehension and speed.
Suppose, as you' re reading along, you lumtebs across a strange word. Did you find your self stopping for a closer look at lumtebs？ Pardon the spelling slip. That' s actually the word stumble (偶然发现). The letter just got mixed around. Obviously you now know that strange words do slow you down--or even stop you completely. Furthermore, strange words hinder (妨碍) comprehension. Which is easier to understand, "eschew garrulity" or "avoiding talking too much"？
What you need is a vital ,dynamic approach to vocabulary building. Hybrid (混合种) corn combines the best qualities of several varieties to ensure maximum productivity. A hybrid approach to vocabulary should, in the same way, ensure maximum results. That' s why you should use the CPD formula.
Through Context
When students in a college class were asked what should be done when they came across an unknown word in their reading, 84 percent said, "Look it up in file dictionary." If you do, however, you short-circuit the very mental processes needed to make your efforts most productive.
But there' s another reason. Suppose someone asks you what the word fast means. You answer, "speedy or swift". But does it mean that in such contexts as "fast color", "fast woman", or "fast friend"？ And if a horse is fast, is it securely tied or galloping (飞驰) at top speed？ It could be either. It all depends. On the dictionary？ No, on context--on how the word is actually used. After all, there are over twenty different meanings for fast in the dictionary. But the dictionary doesn' t tell you which meaning is intended. That' s why it makes such good sense to begin with context.
Through Word Parts
Now for the next step. Often unfamiliar words contain one or more parts, which, if recognized, provide definite help with meaning. Suppose you read that someone "had a predilection for reading mysteries". The context certainly isn' t too helpful. But do you see a prefix, suffix or root that you know？ Well, there' s the familiar prefix pre-, meaning "before'. Look back at th
A．Y
B．N
C．NG
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