单选题We"d like to______a table for five for dinner this evening.

单选题You should learn through failures. Why don't you __ your plan or try a new approach?

单选题He was so ______ at tying fisherman's flies that he was asked to demonstrate his technique at sports fairs and exhibitions.

单选题Infrared scanning technology may be brought back into operation because of ______. ( )

单选题 A very important world problem is the increasing number of people who actually inhabit (居住于) this planet. The limited amount of land and land resources will soon be unable to support the huge population if it continues to grow at its present rate. So why is this huge increase in population taking place? It is really due to the spread of the knowledge and practice of what is becoming known as 'Death Control'. You have no doubt heard of the term 'Birth Control'. 'Death Control' is something rather different. It recognises the work of the doctors and scientists who now keep alive people who, not very long ago, would have died of a variety of then incurable diseases. Through a wide variety of technological creations that include fanning methods and the control of deadly diseases, we have found ways to reduce the rate at which we die. However, this success is the very cause of the greatest threat to mankind. If we examine the amount of land available for this ever-increasing population, we begin to see the problem. If everyone on the planet had an equal share of land, we would each have about 50,000 square metres. This figure seems to be quite encouraging until we examine the amount of usable land we actually have. More than three-fifths of the world's land cannot produce food. Obviously, with so little land to support us, we should be taking great care not to reduce it further. But we are not! Instead, we are consuming its 'capital'—its nonrenewable (不可再生的) fossil fuels and other mineral deposits that took millions of years to form but which are now being destroyed in decades. We are also doing the same with other vital resources not usually thought of as being nonrenewable such as fertile soils, groundwater and the millions of other species that share the earth with us. It is a very common belief that the problems of the population explosion are caused mainly by poor people living in poor countries who do not know enough to limit their reproduction. This is not true. The actual number of people in an area is not as important as the effect they have on nature. Developing countries do have an effect on their environment, but it is the populations of richer countries that have a far greater impact on the earth as a whole.

单选题The Yellow River is the second ______ fiver in Chin

单选题 Experts urge a reforesting of cleared areas, promotion of reduced-impact logging, and ______ agriculture, to maintain the rain forest.

单选题43 By ______ computation, he estimated that the repairs on the house would cost him a thousand dollars.

单选题Researchers have identified 1.4 million animal species so far—and millions remain to be discovered, named, and scientifically described. So how much would it actually cost to 26 every animal on Earth? A pair of Brazilian scientists has crunched (大量运算) the numbers and 27 up with an answer: $263 billion. That's way more than the $5 billion that famed Harvard University biologist Edward O. Wilson estimated back in 2000—and that was for every species on Earth, not just animals. But even $263 billion would be a 28 price to pay to understand the creatures that 29 such essentials as agriculture, fisheries, new drugs, and energy sources, says ornithologist (鸟类学家) Joel Cracraft of the American Museum of Natural History in New York City. 'Literally, the world economy runs on biodiversity,' he says. 'People don't understand really, deeply how much we depend on biodiversity.' Most biologists agree that with extinction rates 30 and climate change looming, the 31 to document the planet's biodiversity—or biota (生物区) —is urgent, 32 considering the essential role these life forms play in crop pollination, clean air, and other aspects of human 33 . 'We are losing species by extinction faster than we are describing new species' according to some estimates, says biologist Antonio Marques, who 34 the new paper with Fernando Carbayo, both at the University of St. Paulo in Brazil. 'We have to know the biota to preserve and conserve the biota,' he says. Besides the money, another huge 35 to a complete understanding of the animal kingdom is a global shortage of taxonomists (分类学家), experts say. A. attempt B. cheaper C. classify D. coauthored E. come F. effort G. enable H. especially I. exactly J. identify K. obstacle L. small M. soaring N. well-being O. yet

单选题Every man in this country has the right to live where he wants to, _____ the color of his skin.

单选题How many fireworks eye injuries occur in the US each year? 

单选题If people feel hopeless, they don't bother to ______ the skills they need to succeed. A. adopt B. acquire C. accumulate D. assemble

单选题I've never ______ the theory that people are more important than animals. A. subscribed to B. hung on C. engaged in D. indulged in

单选题Mrs. Smith warned her son ______ after drinking.

单选题In Australia the Asians have made their influence ______ in businesses, large and small. A. feeling B. feel C. felt D. to be felt

单选题Of course after I gave her my advice, she ______ go and do the opposite.

单选题People who can't ______ between colors are said to be color-blind.

单选题I applied for the job that I saw advertised ______ the paper.