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Yet some important observers of business see things differently. Widely read gurus su
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A.it was man’s first real invention
B.all transportation depends on it
C.every machine depends on it
D.both B and C
Aging is not a disease, but as a person passes maturity, the cells of the body and the【39】they form. do not function as well as they【40】in childhood and adolescence (青春期). The body provides less【41】against disease and is more prone【42】accident.
A number of related cause may【43】aging. Some cells of the body have a fairly long life, but they are not【44】when they die. As a person ages,【45】of brain cells and muscle cells decrease,【46】body cells die and are replaced by new cells. In an aging person the【47】cells may not be as viable (能生存的) or as capable【48】growth as those of a young person.
Another【49】in aging may be changes within the cells【50】. Some of the protein chemicals in cells are known【51】with age and become less elastic. This is why the skin of old people wrinkles and【52】. This is also the reason old people【53】in height. There may be other more important chemical changes in the cells. Some complex cell chemicals, such as RNA, store and【54】information that the cell need. Aging may affect this【55】and change the information carrying molecules so that they do not transmit the information as well.
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A.use to
B.be used to
C.used to
D.had
The first and most obvious thing is that a dictionary will【23】you the spelling of a word. If you' re not sure about the spelling of a word, you can try to find the correct spelling in a dictionary. Words are listed in alphabetical order--a, b, c, and so on .For example, on a dictionary page the word "poor" p, o, o, r--comes before "poverty"--p, o, v, e, r, t, y and the word "poverty" comes【24】the word "power'--p, o, w, e, r. The words are always given in alphabetical Order.
The second thing a dictionary will tell you is【25】. Most dictionaries give the pronunciation of a word in a special kind of alphabet. This special alphabet is called a phonetic, or sound alphabet. The phonetic spelling will tell you generally【26】a word is pronounced. There are a few different phonetic alphabets. Many dictionaries use the International Phonetic Alphabet to show pronunciation.
The【27】thing a dictionary will tell you is the meanings of words. You can【28】a word and find out what it means. Many words have more than one meaning, and a good dictionary will ex plain all of the word' s meanings. For example, in English the common word" get" has over 20 different meanings. The meaning, of course,【29】the sentence in which the word' is used.
These three things--spelling, pronunciation, and meanings--are some of the important【30】that you learn from dictionaries.
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A.books
B.people
C.things
D.thing
The agent was going to ______.
A.give Lane some important papers
B.tell him some pieces of advice
C.tell him some important news
D.tell him his suffering
A.turned out
B.turned over
C.turned up
D.turned off
The source of the sun' s inconstancy is magnetism. Professor William Livingston has developed new theories about its magnetic nature.
"We don' t yet know what causes sun spots, "he says, "but we now think they ' re areas of high level magnetism that come up from the sun' s interior. So strong is their magnetic pull that the highly ionized gas nearby is not able to transmit energy out. "As a result these areas send out less heat and light and thus appear from Earth to be almost dark irregular surface patches.
Sun spot activity generally fluctuates in steady, 11-year cycled. Scientists have long formed the o pinion that as the size and number of sun spots increased, the overall energy sent out by the sun would de crease. Indeed, recent studies confirmed it, revealing that during peak periods of sun spot activity, the Earth experiences a small drop that can be seen clearly in received solar energy.
Could such a small drop in energy have an effect here on earth? Perhaps some scientists think the world temperature could fall by' as much as 0.2 during periods of high solar magnetism.., enough to cause significant fluctuations in weather patterns.
According to the passage, it is believed that the sun ______ .
A.moves in a quick but steady way year after year
B.sends out less and less heat and light with each passing year
C.radiates the same amount of light every year
D.might have a strong influence on the weather patterns
Television, although not essential, has become an important part of most people’s lives. It alters people's ways of seeing the world; in many ways, it supports and sustains (维持) modern life. Television has become a baby-sitter, an introducer of conversations, the major transmitter of culture, a keeper of tradition. Yet when what can be seen on TV in one day is critically analyzed, it becomes evident that television is not a teacher but a sustainer; the poor quality of programming does not elevate (提高)people into greater understanding, but rather maintains and encourages the life as it exists.
The primary reason for the lack of quality in American television is related to both the history of TV programming development and the economics of TV. Television in America began with the radio. Radio companies and their sponsors first experimented with television. Therefore, the close relationship which the advertisers had with radio programs became the system for American TV. Sponsors not only paid money for time within programs, but many actually produced the programs. Thus, in American society, television is primarily concerned with reflecting and attracting society rather than experimenting with new ideas. Advertisers want to attract the largest viewing audience possible. To do so requires that the programs be entertaining rather than educational, attractive rather than challenging.
Television in America today remains, to a large extent, with the same organization and standards as it had thirty years ago. The hope for further development and true achievement toward improving society will require a change in the entire system.
According to the author American television is poor in quality because ______.
A.advertisers are interested in experimenting with new ideas
B.it is still at an early stage of development, compared with the radio
C.the programs have to be developed in the interests of the sponsors for economic reasons
D.it is controlled by radio companies
The word "scan" in the second paragraph probably means______.
A. reading carefully
B. reading quickly and not word by word
C. reading by repeating some important words
D. reading more than one article at the same time
Social scientists are, of course, extremely interested in these types of questions. They want to explain why we possess certain characteristics and exhibit certain behaviors. There are no clear answers yet, but two distinct schools of thought on the matter have been developed. As one might expect, the two approaches are very different from one another, and there is a great deal of debate between proponents of each theory. The controversy is often referred to as " nature/nurture".
Two who support the" nature" side of the conflict believe that our personalities and behavior. patterns are largely determined by biological and genetic factors. That our environment has little, if anything, to do with our abilities, characteristics, and behavior. is central to this theory. Taken to an extreme, this theory maintains that our behavior. is predetermined to such a degree that we are almost completely governed by our instincts.
Proponents of the " nurture" theory, or as they are often called, behaviorists, claimed that our environment is more important than our biologically based instincts in determining how we will act. A behaviorist, B. F. Skinner, sees humans as beings whose behavior. is almost completely shaped by their surroundings. The behaviorists view of the human being is quite mechanistic; they maintain that, like machines, humans respond to environmental stimulus as the basis of their behavior.
Neither of these theories can yet fully explain human behavior. In fact, it is quite likely that the key to our behavior. lies somewhere between these two extremes. That the controversy will continue for a long time is certain.
Which of the following statements would supporters of the" nature" theory agree with?
A.A person's instincts have little effect on his actions.
B.Environment is important in determining a person's behavior. and personality.
C.Biological reasons have a strong influence on how we act.
D.The behaviorists' view correctly explains how we act.