单选题He thinks that the ecosystems assessment will fare better if it is intended as "guidance only and is not in any way an ______ measure."

单选题By the first sentence of the passage the author means the US scientists______.

单选题The author mentions each of the following as an advantage of Chicago's location EXCEPT its ______.

单选题The birchbark canoe is not as ______ as it appears; it is built to withstand long journeys over rough waters.

单选题Chimpanzees are frequently used as stand-ins for human beings in experiments.

单选题No other drugs are as good as this one; it must have been based on a(n)______formula.

单选题He was a member of the Hillary______that conquered Mount Everest.

单选题Developmental psychologists often cite yelling at children as______and a poor way to help them learn.

单选题He obviously displayed a great ______ for some of your poems.

单选题Native-places, which transcend national boundaries to become central to the organization of emigrants communities, have historically been at the root of social organization with China. Native place has traditionally referred to the particular village or region where one's ancestors originated. It signifies not only the physical place itself but also the deep attachments to the land, customs, and people from that place that are forged through generations of shared ancestry and history. It is through these bonds and sentiments, signified by genealogical connections to the ancestors buried there as well as contact with the soil and water, that space is turned into place. Ties to native place are inherited, so that even immigrants to other parts of China would still claim their grandfather's native place as their own place of origin, even if they had never been there. As the second and third generations, many American-born Chinese Americans have learned about China only second-hand through family stories or media and popular culture images. For them China is at the same time a distant and foreign place and a place to which they have a connection. In this sense, ideas about China that came across in a highly mediated fashion are of central importance to the ways that Chinese Americans perceive their Chineseness. For many young overseas Chinese, ties to China carry little emotional or practical importance, and personal identity may only partly involve identification as Chinese. They distinguish between "cultural roots and citizenship". Many Chinese overseas, removed from mainland China by time and cultural distance visit China without a desire to find their ancestral villages. For many Chinese Americans, Beijing represents the essence of Chinese civilization. They may identify more the Great Wall with their native villages. Images of China come in packaged representations through the media, history books, and documentaries. This phenomenon is represented in overseas Chinese tourism, which combines an interest in general Chinese history with a tenuous connection to home villages. Most visits to the mainland, organized by foreign travel agencies within Chinese communities abroad, involve a tour of major historical sites and famous cities in China, most often followed by a trip to the native village. Therefore, it is through their experiences in China that Chinese Americans reevaluate and reframe their ideas about Chineseness in relation to their identities as Chinese Americans. It is through interaction with their places of ancestral origin in China that Chinese Americans remake these places into transnational space connecting America and China. Chinese-American roots-searching trips to China must be viewed within a multi-layered political and historical context, and as more of a reterritorialization than a return to territory, Ideas of place can be transformed from afar from concrete notions of villages to abstract notions of nation, or they can be overlaid as geographies to tame an unfamiliar and hostile environment. Even from a distance, China remains relevant to Chinese Americans in numerous ways as a powerful influence shaping their identities.

单选题Having liberated the player from an exclusively team performance, Louis Armstrong Uunwittingly/U codified the vocabulary of the soloist in a series of famous recordings.

单选题They demand to set up an organization flexible enough to cope with any emergency. A. portable B. valiant C. trivial D. mobile

单选题A very important world problem is the increasing number of people who actually inhabit 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 recognizes 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 innovations that include farming 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 meters. 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 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Passage 3 The biosphere is the name biologists give to the sort of skin on the surface of this planet that is inhabitable by living organisms. Most land creatures occupy only the interface between the atmosphere and the land; birds extend their range for a few hundred feet into the atmosphere; burrowing invertebrates (无脊椎动物) such as earthworms may reach a few yards into the soil but rarely penetrate farther unless, it has been recently disturbed by men. Fish cover a wider range, from just beneath the surface of the sea to those depths of greater than a mile inhabited by specialized creatures. Fungi (真菌) and bacteria are plentiful in the atmosphere to a height of about half a mile, blown there by winds from the lower air. Balloon exploration of the stratosphere (同温 层) as long ago as 1936 indicated that moulds and bacteria could be found at heights of several miles, recently the USA's National Aeronautics and Space Administration has detected them, in decreasing numbers, at heights up to eighteen miles. They are pretty sparse at such levels, about one for every two thousand cubic feet, compared with 50 to 100 per cubic foot at two to six miles (the usual altitude of jet aircraft), and they are almost certainly in an inactive state. Marine bacteria have been detected at the bottom of the deep Pacific trench, sometimes as deep as seven miles; they are certainly not inactive. Living microbes have also been obtained on land from cores of rock drilled (while prospecting for oil) at depths of as much as 1,200 feet. Thus we can say, disregarding the exploits of astronauts, that the biosphere has a maximum thickness of about twenty-five miles. Active living processes occur only within a compass of about seven miles, in the sea, on land and in the lower atmosphere, but the majority of living creatures live within a zone of a hundred feet or so. If this planet were sealed down to the size of an orange, the biosphere, at its extreme width, would occupy the thickness of the orange-colored skin, excluding the pith. In this tiny zone of our planet takes place the multitude of chemical and biological activities that we call life. The way in which living creatures interact with each other, depend on each other or compete with each other, has fascinated thinkers since the beginning of recorded history. Living things exist in a fine balance which is often taken for granted, from a practical point of view, things could not be otherwise. Yet it is a source of continual amazement to scientists because of its intricacy and delicacy. The balance of nature is obvious most often when it is disturbed. Yet even here it can seem remarkable how quickly it readjusts itself to a new balance after a disturbance. The science of ecology--the study of the interaction of organisms with their environment--has grown up to deal with the minutiae of the balance of nature.

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单选题After failing his mid-term exams, Jeremy was ______ face his parents.