单选题The word “sustainable” in the last paragraph is closest in meaning to .

单选题 下面有3篇短文，每篇短文后有5道题，每道题后面有4个选项。请根据文章的内容，从每题所给的4个选项中选择1个最佳答案。{{B}}第一篇{{/B}} {{B}} "Salty" Rice Plant Boosts Harvests{{/B}} British scientists are breeding a new generation of rice plants that will be able to grow in soil containing salt water. Their work may enable abandoned farms to become productive once more. Tim Flowers and Tony Yeo, from' Sussex University's School of Biological Sciences, have spent several years researching how crops, such as rice, could be made to grow in water that has become salty. The pair have recently begun a three-year programme, funded by the Biotechnology and Biological Sciences Research Council, to establish which genes enable some plants to survive salty conditions. The aim is to breed this capability into crops, starting with rice. It is estimated that each year more than 10m hectares (公顷) of agricultural land are lost because salt gets into the soil and stunts (妨碍生长) plants. The problem is caused by several factors. In the tropics, mangroves (红树林) that create swamps (沼泽) and traditionally formed barriers to sea water have been cut down. In the Mediterranean, a series of droughts have caused the water table to drop, allowing sea water to seep (渗透) in. In Latin America, irrigation often causes problems when water is evaporated (蒸发) by the heat, leaving salt deposits behind. Excess salt then enters the plants and prevents them functioning normally. Heavy concentrations of minerals in the plants stop them drawing up the water they need to survive. To overcome these problems, Flowers and Yeo decided to breed rice plants that take in very little salt and store what they do absorb in cells that do not affect the plants' growth. They have started to breed these characteristics into a new rice crop, but it will take about eight harvests before the resulting seeds are ready to be considered for commercial use. Once the characteristics for surviving salty soil are known, Flowers and Yeo will try to breed the appropriate genes into all manners of crops and plants. Land that has been abandoned to nature will then be able to bloom again, providing much needed food in the poorer countries of the world.

单选题The movie has a satisfying ending. A．pleasing B．sad C．interesting D．horrific

单选题The committee comprises five persons.

单选题The most prominent characteristics of handwriting are undoubtedly letter formation and slant. A. presumably B. in many cases C. surely D. without bias

单选题The report {{U}}advocated{{/U}} setting up day training colleges. A. supposed B. excited C. suggested D. discussed

单选题Before herbs were available in supermarkets year-round, herb vinegar was made in the fall.

单选题If you had gone over your test paper carefully before handing it in, you would have made fewer mistakes.

单选题But for some teachers, the learning curve with the device is steep, and a generation gap has opened with teachers who are still accustomed to writing lesson plans with a pen and paper. Many older educators are" Petrified" (吓呆的，惊呆的) of the boards, says Peter Kornicker, a media specialist at P. S. 161 in Harlem, where despite a student poverty rate of 98 percent, all 35 classrooms are equipped with touchscreens. "Always, it comes back to the ability of teachers to leverage this technology, "says Andy Rotherham of Education Sector, a Washington, D. C. - based think tank. "We have to train them to use it. Otherwise, it' just another underused', expensive thing. " What does "to leverage" in bold most probably mean?A. To useB. To equipC. To learnD. To buy

单选题As a matter of fact, I love soft music more than popular music.A. basicallyB. probablyC. actuallyD. accurately

单选题The soldier {{U}}displayed{{/U}} remarkable courage in the battle. A. placed B. showed C. pointed D. decided

单选题We can no longer tolerate his actions.

单选题 Weather Map A weather map is an important tool for geographers. A succession of three of four maps presents a continuous picture of weather changes. Weather forecasts are able to determine the speed of air masses and fronts; to determine whether an individual pressure area is deepening or becoming shallow and whether a front is increasing or decreasing in intensity. They are also able to determine whether an air mass is retaining its original characteristics or taking on those of the surface over which it is moving. Thus, a most significant function of the map is to reveal a synoptic picture of conditions in the atmosphere at a given time. All students of geography should be able to interpret a weather map accurately. Weather maps contain an enormous amount of information about weather conditions existing at the time of observation over a large geographical area. They reveal in a few minutes what otherwise would take hours to describe. The United States weather Bureau issues information about approaching storms, floods, frosts, droughts, and all climatic conditions in general. Twice a month it issues a 30-day "outlook" which is a rough guide to weather conditions likely to occur over broad areas of the United States. These 30-day outlo6ks are based upon an analysis of the upper air levels with often Set the stage for the development of air masses, fronts, and storms. Considerable effort is being exerted today to achieve more accurate weather predictions. With the use of electronic instruments and earth satellites, enormous gains have taken place recently in identifying and tracking storms over regions which have but few meteorological stations. Extensive experiments are also in progress for weather modification studies. But the limitations of weather modification have prevented meteorological results except in the seeding of super-cooled, upslope mountainous winds which have produced additional orographical precipitation on the windward side of mountain ranges. Nevertheless, they have provided a clearer understanding of the fundamentals of weather elements.

单选题He will consolidate his power. A. strengthen B. win C. abandon D. unite

单选题Her sister urged her to apply for the job.

单选题The passage is mainly about

单选题Joe came to the window as the crowd Uchanted/U “Joe, Joe, Joe.”

单选题 {{B}}Changing in English Language{{/B}} When one looks back upon the fifteen hundred years that are the life span of the English language, he should be able to notice a number of significant truths. The history of our language has always been a history of constant change—at times a slow, almost imperceptible change, at other times a violent collision between two languages. Our language has always been a living growing organism; it has never been static. Another significant truth that emerges from such a study is that language at all times has been the possession not of one class or group but of many. At one extreme it has been the property of the common, ignorant folk, who have used it in the daily business of their living, much as they have used their animals or the kitchen pots and pans. At the other extreme it has been the treasure of those who have respected it as an instrument and a sign of civilization, and who have struggled by writing it down to give it some permanence, order, dignity, and if possible, a little beauty. As we consider our changing language, we should note here two developments that are of special and immediate importance to us. One is that since the time of the Anglo Saxons there has been an almost complete reversal of the different devices for showing the relationship of words in a sentence. Anglo-Saxon (old English) was a language of many inflections. Modern English has few inflections. We must now depend largely on word order and function words to convey the meanings that the older language did by means of changes in the forms of words. Function words, you should understand, are words such as prepositions, conjunctions, and a few others that are used primarily to show relationships among other words. A few inflections, however, have survived. And when some word inflections come into conflict with word order, there may be trouble for the users of the language, as we shall see later when we turn our attention to such maters as WHO or WHOM and ME or I. The second fact we must consider is that as language itself changes, our attitudes toward language forms change also. The eighteenth century, for example, produced from various sources a tendency to fix the language into patterns not always set in and grew, until at the present time there is a strong tendency to restudy and re-evaluate language practices in terms of the ways in which people speak and write.

单选题I am sure I can persuade him into letting us stay in the hotel for the night.

单选题Rumors began to （circulate） about his financial problems.