Penicillin was discovered by chance in 1928. finally accidentally experimentally opportunely

Many photographers prefer to take pictures at twilight when they can take advantage of the special effects of the setting sun. at dusk at noon in the spring in the fall

The poem is attributed to one of Emily Dickinson’s. testified as handed out by identified as predicted as

The Coriolis force causes all moving projectiles on Earth to be deflected from a straight line. spring deviate be retracted be conceived

Bladder wrack, a tough, leathery brown seaweed, clings to rocks tenaciously. grows under hides under sticks to yields to

Sue was distraught waiting for her mother to come to last night. make a social debut regain consciousness come home in spite of difficulty meet her immediately

Psychologists have done extensive studies of how well patients comply with doctors’ orders. obey understand improve with agree with

The Pop Art of the 1960’s used imagery drawn from the everyday world. understood by approved by censored in taken from

Winners and Losers Why are the biggest winners in the past decade of trade globalization mostly in South and East Asia, whereas the biggest losers are mostly in the former Soviet bloc (集团) and sub-Saharan Africa? History is a partial guide: East Asia has a long trading tradition, Lately reinvigorated (给以新的活力) by the Chinese adoption of market economics. The Soviet Union, on the other hand, was sheltered from free-market forces for more than 70 years. In Africa, some countries are disadvantaged because of inadequate infrastructure (基础结构); many countries have little to trade hut commodities, the prices of which have fallen in recent years. In some regions, certain countries have suffered by adopting misguided policies, often under pressure from International Monetary Fund. First among these is Russia, which in the early 1990s tried to embrace capitalism before first building the institutions that make capitalism work, such as an independent bank system, a system of business law, and an adequate method for collecting taxes. Encouraged by the IMF, the World Bank and the U. S. Department of the Treasury, President Boris Yeltsin’s regime privatized the state-owned industrial sector, creating a class of oligarchs (寡头政治集团成员), who, knowing how unstable conditions were at home, sent their money abroad instead of investing it at home. In contrast, China, the biggest winner from globalization, did not follow the IMF formula. Of the former states of the Soviet bloc, only a few, notably Poland and Hungary, managed to grow, which they did by ignoring IMF advice and adopting expansionary plans, including spending more than they collected in taxes. Botswana and Uganda are also success stories: despite their disadvantages, their countries achieved vigorous growth by creating stable civil societies, liberalizing trade and implementing reforms that ran counter to IMF prescriptions.

As they move, glaciers push piles of rocks ahead of them. toward above in front of alongside of

Insects thrive all over, from the hottest deserts to the snow-clad peaks of lofty mountains. silently totally everywhere overhead

Male lions remain<> aloof from<> the day-to-day activities of their families. upwind of separate from exhausted from bored with

By the time the war broke out, most of the people had already left. began spoiled the country became less widespread intervened

The Taconic Mountains form part of the dividing line between New York and Massachusetts. geographic dispute boundary scenic attractions territory

Geology and Health The importance of particular metals in the human diet has been realised within the past few decades, and the idea that geology might be related to health has been recognized for a number of elements such as iodine, zinc and selenium. For example, soils with low iodine contents produce crops and animals deficient in iodine. A lack of iodine in the human diet leads to some serious diseases. The ultimate source of metals within the human body is rocks, which weather into soil, gaining or losing some of their chemical constituents. The crops we eat selectively remove from the soil the elements that they require for growth. The water we drink contains trace elements leached from rock and soil. Thus the geology and geochemistry of the environment have effects on the chemistry and health of plants, animals and people. So far there is no data to suggest that people living on metal-rich soils experience a potential health hazard. The levels of metals within naturally contaminated soils are generally not high enough to cause serious health problems. Living on metal-rich soils does not represent a health risk unless large quantities of soil are digested or metal-rich dust is inhaled. However, small children are particularly exposed to metal-rich dust topsoil in playgrounds and gardens. They are also the most likely ones to eat potentially dangerous metal-rich soil. Heavy metals are persistent: they do not break down to other chemicals in the environment. Industrially polluted sites usually undergo intensive clean-up and rehabilitation because heavy metals are a health concern once they enter the food chain. Some trace metals are alleged to cause cancer and are also known to cause poisoning. In contrast naturally contaminated soils have not been subject to risk assessment studies and rehabilitation measures, despite the fact that they frequently possess metal concentrations well above those of such polluted by humans and above environmental quality criteria. There is a vital need to understand the potential risks and long-term health effects of living on naturally contaminated soils. Future environmental investigations of naturally polluted soils should concentrate on the potential pathways of metals into the food chain and human body. Geologists should be part of such studies as they can provide the essential background information on rock and soil chemistry as well as the chemical forms of heavy metal pollution.

Eat Healthy “Clean your plate!” and “Be a member of the clean plate club!” Just about every kid in the US has heard this from a parent or grandparent. Often, it’s accompanied by an appeal: “Just think about those starving orphans in Africa!” Sure, we should be grateful for every bite of food. Unfortunately, many people in the US take too many bites. Instead of staying “clean the plate”, perhaps we should save some food for tomorrow. According to news reports, US restaurants are partly to blame for the growing bellies. A waiter puts a plate of food in front of each customer, with two to four times the amount recommended by the government, according to a USA Today story. Americans traditionally associate quantity with value and most restaurants try to give them that. They prefer to have customers complain about too much food rather than too little. Barbara Rolls, a nutrition professor at Pennsylvania State University, told USA Today that restaurant portion sizes began to grow in the 1970s, the same time that the American waistline began to expand. Health experts have tried to get many restaurants to serve smaller portions. Now, apparently, some customers are calling for this, too. The restaurant industry trade magazine QSR reported last month that 57 percent of more than 4,000 people surveyed believe restaurants serve ‘portions that are too large; 23 percent had no opinion; 20 percent disagreed. But a closer look at the survey indicates that many Americans who can’t afford fine dining still prefer large portions. 70 percent of those earning at least $150,000 per year prefer smaller portions; but only 45 percent of those earning less than $ 25,000 want smaller. It’s not that working class Americans don’t want to eat healthy. It’s just that, after long hours at low-paying jobs, getting less on their plate hardly seems like a good deal. They live from paycheck to paycheck, happy to save a little money for next year’s Christmas presents.

Generation Gap A few years ago, it was fashionable to speak of a generation gap, a division between young people and their elders. Parents complained that children did not show them proper respect and obedience, while children complained that their parents did not understand them at all. What had gone wrong? Why had the generation gap suddenly appeared? Actually, the generation gap has been around for a long time. Many critics argue that it is built into the fabric of our society. One important cause of the generation gap is the opportunity that young people have to choose their own life styles. In more traditional societies, when children grow up, they are expected to live in the same area as their parents, to marry people that their parents know and approve of, and often to continue the family occupation. In our society, young people often travel great distances for their education, most out of the family home at an early age, marry or live or choose occupations different from those of their parents. In our upwardly mobile society, parents often expect their children to do better than they did: to find better jobs, to make more money, and to do all the things that they were unable to do. Often, however, the ambitions that parents have for their children are another cause of the division between them. Often they discover that they have very little in common with each other. Finally, the speed at which changes take place in our society is another cause of the gap between the generations. In a traditional culture, elderly people are valued for their wisdom, hut in our society the knowledge of a lifetime may Become obsolete overnight. The young and the old seem to live in two very different worlds, separated by different skills and abilities. No doubt, the generation gap will continue to be a feature of American life for some time to come. Its causes are rooted in the freedoms and opportunities of our society, and in the rapid pace at which society changes.

His marked personality changes were brought about by a series of unfortunate events. preceded accompanied caused hastened

My wife wants me to do away with my shoes. dispense with get rid of do without maul

The Deer’s Death He ran close, and again stood still, stopped by a new fear. Around him the grass was whispering and alive. He looked wildly about, then down. The ground was black with ants, great energetic ants that took no notice of him, but hurried towards the fighting shape. And as he drew in his breath and pity and terror seized him, the beast fell and the screaming stopped. Now he could hear nothing but a bird singing, and the sound of the rustling (沙沙声) whispering ants. He peered over at the blackness that twitched with the jerking(抽搐) nerves. It grew quieter. There were small twitches from the mass that still looked vaguely like the shape of a small animal. It came into his mind that he could shoot it and end its pain; and he raised the gun. Then he lowered it again. The deer could no longer feel; its fighting was a mechanical protest of the nerves. But it was not that which made him put down the gun. It was a swelling feeling of rage and misery and protest that expressed itself in the thought: if I had not come it would have died like this, so why should I interfere? All over the bush things like this happen; they happen all the time; this is how life goes on, by living things dying painfully. I cannot stop it. He was glad that the deer was unconscious and had gone past suffering so that he did not have to make a decision to kill it. At his feet, now, were ants tricking back with pink fragments in their mouths and there was a fresh acid smell in his nose. He sternly controlled the uselessly convulsing(痉挛的) muscles of his empty stomach, and reminded himself: the ants must eat, too. The shape had grown small. Now it looked like nothing to be recognized. He saw the blackness thin, and bits of white showed through, shining in the sun—yes, there was the sun just up. Then the boy looked at those insects. A few were standing and gazing up at him with small glittering eyes. “Go away!” he said to the ants coldly. “I am not for you—not just yet, at any rate.” He bent over the bones and touched the sockets(孔) in the skull: that was where the eyes were, he thought suspiciously, remembering the liquid eyes of a deer. That morning, perhaps an hour ago, this small creature had been stepping proud and free through the bush even as he himself had done. Proudly stepping the earth, it had smelt the cold morning air. Walking like kings, it had moved freely through this bush, where each blade of grass grew for it alone, and where the river ran pure sparkling water for it to drink. And then—what had happened? Such a sure swift footed thing could surely not be trapped by a swarm of ants?