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The machinery had been wrecked so efficiently that police were sure it was a case of ______.

The scents of the flowers was ______ to us by the breeze.

Successful scientists always check statements and make new experiments carefully and objectively to ______ them.

No men were allowed to ______ on the livelihood of his neighbor.

It’s a ______ timetable. Sometime lessons happen, sometimes they don’t.

He always ______ his failure in obtaining a job to bad luck.

科学和技术作为两个不同的范畴，共同起源于人类的生产实践活动。然而随着劳动分工的发展，两者却分道扬镳，各自循着不同的路径独立发展了。科学的职责在于认识和揭示自然界的规律，而技术的进步，主要是那些直接掌握生产工具的工匠们的事。

Vacations are more necessary now than before because today the average life is less well-rounded and has become increasingly compartmentalized. I suppose the idea of vacations, as we conceive it, must be incomprehensible to primitive peoples. Rest of some kind has of course always been a part of the rhythm of human life, but earlier ages did not find it necessary to organize it in the way that modern man has done. Holidays and feast days were sufficient.With modern man’s increasing tensions, with the stultifying quality of so much of his work, this break in the year’s routine became steadily more necessary. Vacations became mandatory for the purpose of renewal and repair. And so it came about that in the United States, the most self-indulgent of nations, the most tense and compartmentalized, vacations have come to take a predominant place in domestic conversation.

A manufacturer does not usually deal directly with people who use his products. He sells his products to them indirectly through (1) outlets. Therefore his selling problem has two aspects: He must (2) storekeepers that it will be (3) for them to stock the things he manufactures, and he must (4) thousands or millions of unseen people to buy his products from storekeepers in various places. This kind of selling (5) both trade advertising and consumer advertising. The manufacturer places advertisements in trade magazines that are read by (6) who sells his type of products. He then undertakes more costly advertising (7) to the consumer.Advertisers know from practical experience that products, old or new, cannot be (8) people. In the modern economy “the consumer is the king.” Customers are (9) what they want. Much money is spent on research (10) an effort to understand the consumer’s desires. (11) these efforts to please the public, (12) are often fickle. They (13) their preferences from one brand to another or from one type of product to another. In many instances no amount of advertising, (14) clever or persuasive, can keep people from making such changes. (15), advertising itself is often the cause of the customer’s decision to change products.

The early use of a [A] complete steel frame for towering buildings [B] appeared in the [C] first skyscraper, [D] built on Chicago in 1883.

[A] As her focus [B] changed, the love poetry that Edam St. Vincent Millay [C] produced in the 1920’s [D] increasing gave way to poetry dealing with social injustice.

Louis Braille designed a form of communication [A] enabling people [B] to convey and preserve their thoughts [C] to incorporate a series of dots which [D] were read by the finger tips.

[A] Standing in the drive way, the house [B] appeared to be much smaller than it had [C] seemed to us [D] as children many years ago.

[A] As regards our foreign policy, it is [B] no less our interest [C] as our duty to maintain the most Friendly [D] relations with other countries.

These difficulties should not hinder us [A] from establishing normal state relations, [B] still less [C] they should lead to [D] war.

Behind the [A] aluminum’s versatility [B] lies properties so diverse that [C] they almost seem to belong to several different [D] metals.

The foremost concern of the American young people in 1960’s [A] was with [B] training and finding a job that could support [C] them in those under [D] times.

Despite [A] it is both the largest and [B] the northernmost state [C] in the United States, Alaska has [D] the smallest population.

He [A] had never heard [B] a word of English [C] being spoken, though he [D] had translated a collection of English short stories into Chinese.

Most Americans think of vegetarians as a minority, as food faddists. In fact, in this country people who include meat in their diets are the majority; but throughout the world, meat eaters are, and have been, the minority themselves. Though archaeologists can demonstrate that humans have kept animals for food for thousands of years, meat was generally for the rich: the poor in most countries are vegetarians. And the followers of many religions are also vegetarians. The Hindus, the Buddhists, the Sufis, and other groups do not eat meat.In fact, religion is a major reason still for choosing a vegetarian diet; many religions teach that eating meat weakens one’s spirit. Adam and Eve were told to eat fruits and vegetables, according to Genesis. When Daniel was facing the lions, he followed a vegetarian diet, so he could remain pure.Other vegetarians believe they are healthier than people who eat meat. Though this has never been scientifically proved, popular works on vegetarian diets often promise better health. There is evidence to show that vegetarians have greater stamina, and many people on vegetarian diets live long lives.Some people do not eat meat for economic reasons; meat is expensive and, in many parts of the world, very scarce. The most common reason for choosing a vegetarian diet, though, is the ethical one. Why do humans feel that they must kill other beings in order to eat well? Most vegetarians admit that they find eating the flesh of dead animals revolting. In fact, they refer to “flesh-eaters” as we might refer to cannibals and also use the zoo label “carnivore” interchangeably.Because choice of diet is a cultural and ethical matter, not all vegetarian diets are alike. Ovo-vegetarians eat vegetables, but will allow themselves eggs. The lactovegetarian eats vegetables mainly, but adds dairy foods such as milk and cheese. These two categories of vegetarians feel that eggs and dairy products are permissible; taking these products does no harm to the cow or chicken. Strict vegetarian ways are represented by the Vegan Society, whose members prefer the label “vegan.” Vegans live “on the products of the plant kingdom.” Not only do vegans avoid meat; they also avoid eggs, honey, and milk in any form. They reason that it is as cruel to rob animals as it is to kill animals.A vegetarian must be careful to maintain a balanced diet; and of course a carnivore—or omnivore, really, because most people in America eat both meat and vegetables—must be equally careful. Excellent nutrition is important, whether for vegetarians or the rest of us (many people who eat meat assume their diet is nutritional for that reason alone). No one has ever been able to prove definitely that one diet is more beneficial than the other.The most compelling argument in favor of vegetarianism, however, is vegetarianism’s efficiency. The periodical Scientific American estimated in 1976 that there are enough plants to support several times the current world population; but if those plants are first fed to an animal to fatten it for slaughter, there is an 80 percent loss in efficiency by the time a human eats a pound of meat. Every human consumes 260 pounds of food annually to avoid starvation, and there are adequate food crops available to provide that 260 pounds for every one of us. The question is: Do we eat the plants, or do we eat the animal to which we feed them? And do we let someone else go hungry?1. The purpose of this passage is to .2. According to the passage, which of the following statements is not true?3. We can conclude from the passage that .4. The passage suggests that .5. As used in this passage, the word “faddists” means .

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