读理解练习模拟。
11. Which of the following is the best title for the passage?
A. The Melting of Icebergs
B. The Nature and Origin of Icebergs
C. The Size and Shape of Icebergs
D. The Dangers of Icebergs
12. The author states that icebergs are rarely seen because they are .
A. surrounded by fog
B. hidden beneath the mountains
C. located in remote regions of the world
D. broken by waves soon after they are formed
13. According to the passage, icebergs are dangerous because they .
A. usually melt quickly
B. can turn over very suddely
C. may create immense snowdrifts
D. can cause unexpected avalanches
14. The formation of an iceberg is most clearly analogous to which of the following activities?
A. Walking on fluffy new snow, causing it to become more compact and icy.
B. Plowing large areas of earth, leaving the land flat and barren.
C. Skating across a frozen lake and leaving a trail behind.
D. Blowing snow into one large pile to clear an area.
15. The attitude of the author toward icebergs is one of .
A. disappointment
B. humor
C. disinterest
D. wonder
Passage 4
One fact that clearly demonstrated by the early sleep researchers: one part of the night is not just like another. As scientists began to compare the records of volunteers during the 1950's, they observed that human sleep follows a rhythmic schedule. They noted that not only was this schedule much the same in healthy persons of the same age with similar habits but, from night to night, each individual had an EEG record almost as consistent as a signature.
Sleep and wakefulness, once considered to be the light and dark of consciousness, no longer seem to differ so sharply. Actually, sleep is not a unitary state, it involves many shades or degrees of detachment from the surrounding world. While sleep may feel like a blanket of darkness punctuated by dreams-a time when the mind is asleep-nothing could be less true. All night long a person drifts down and up through different levels of consciousness, as if on waves. With laboratory methods, researchers have been able to chart the typical stages of the journey into sleep.
The journey starts while the subject is still awake but beginning to relax. His brain waves, which have been low, rapid, and irregular, begin to show a new pattern, the alpha rhythm.
When their EEG shows an alpha rhythm, the subjects are notified, either by a sound or by the appearance of a color on a screen. Because the alpha state tends to be pleasant and relaxed, the ability to sustain it can help tense people ease their passage into sleep. A moment of tension, a loud noise, an attempt to solve a problem, however, and the alpha rhythm may vanish.
As the subject passes through the gates of the unconscious, his alpha waves grow smaller, and his eyes roll very slowly. For a moment, he may wake up during this early part of the descent, alerted by a sudden spasm that causes his body to jerk. It is cauesd by a brief burst of activity in the brain, and is normal in all human sleep. It is gone in a fraction of a second, after which descent continues. The subject has not felt the peculiar transformation, but now he is said to be truly asleep.
16. This passage states that a person is really asleep only .
A. when his EEG begins to show an alpha rhythm
B. after the completion of his alpha rhythm
C. when his EEG reveals no alpha rhythm
D. after experiencing a jerk
17. According to the author, the alpha state has been shown to be .
A. a brief burst of activity in the brain
B. controllable
C. unpleasant for some people
D. unmeasurable
18. According to the passage, was used by sleep researchers.
A. music
B. ladder
C. charts
D. signature
19. According to this passage, sleep is described as .
A. a gradual parting from the real world
B. drowning in an ocean of darkness
C. undisturbed by tension or problems
D. dependent only upon individual age and health
20. The word"subjects"(para.3,line 1)refers to .
A. measurements
B. instruments
C. dreams
D. volunteers
1.分析与解答：答案为B。参看第一段第三、的四句。
2.分析与解答：答案为D。“know which side one's bread is buttered”意为“知道自己的利处在哪儿。”故选D。
3.分析与解答：答案为C。参看第二段第一句。
4.分析与解答：答案为B。参看第二段最后一句。
5.分析与解答：答案为D。A，B，C三项都是事实，在文章中都提到过。文章并未讲“面包是古人唯的食品。”故D不对。
6.分析与解答：这是一道主旨题，作者反对人们都穿制服目的是要提倡人们不要穿制服，故选D。
7.分析与解答：“same food”和“same car”只不过是作者为论证自己的观点所做的比较,故应选C。
8.分析与解答：见第二段第句，答案为B。
9.分析与解答：根据第三段第五句话，人们不买有个性的东西了，营业员自然就过剩了，故应选C。
10.分析与解答：文章从始至终都在说穿制服的缺点，可推断答案应选B。
11.分析与解答：在把握全篇的基础上，答案为B。
12.分析与解答：根据第一段第二句，应选C。
13.分析与解答：根据第三段第三、的四句话，选B。
14.分析与解答：参见第五段，选A。
15.分析与解答：根据文章第一句话便可推断出作者的语气态度，应选D。
16.分析与解答：答案为D。根据第五段最后一句可得知答案。其它选项与原文不符。
17.分析与解答：答案为B。根据第四段的描写可得知答案。其它选项与原文不符。
18.分析与解答：答案为B。根据第二段最后一句的描写可得知答案。其它选项与原文不符。
19.分析与解答：答案为A。根据第二段第二句可得知答案。其它选项与原文不符。...detachment
from the real world=parting from
20.分析与解答：答案为D。subjects 在此文中意为volunteers受测者。其它选项与原文不符。
