单选题Laser beams can be used to bore metals and other hard materials.

单选题The curious look from the strangers around her made her feel uneasy.

单选题I think their plan will work, but they themselves are very suspicious about it.A. certainB. worriedC. confidentD. dnllbflul

单选题The author brushed his teeth over and over

单选题A crowd gathered to see what had happened.

单选题Who takes the Olympic oath?

单选题Children don't ______ understand what are reciting, but gradually it will have in impact on thinking.A. necessarilyB. profitablyC. unnecessarilyD. unprofitably

单选题The compact dictionaries published in recent years are not as {{U}}unwieldy{{/U}} as some of the older editions.

单选题Richard Wagner Richard Wagner (1813 ~ 1883) is regarded by many 【51】 "The Revolutionist of Opera, "who demolished all old forms, and who reconstructed the music drama 【52】 principles entirely his own. In the strictest 【53】 , this belief is not justified, for Wagner simply returned to the oldest version of the music drama. He found that the ideal construction of the opera in Florence had been to produce work in which the music, drama and interpretation should be 【54】 equal importance. Wagner studied the changes and abuses which Gluck had 【55】 correct, and found that the opera 【56】 of the nineteenth century had 【57】 back into many of the old customs, with the result, that there was no longer a complete 【58】 of the three fundamentals of opera. Wagner tells us in his autobiography that his early life was influenced by the dramas of Shakespear, the symphonies of Beethoven, and the operas of Von Weber. His first operas were constructed on the lines of the French grand opera. The first two were absolute failures, but with the 【59】 of "Rienzi" in 1842, Wagner was proclaimed the equal, if not the superior, 【60】 Bellini, Donizetti and Meyerbeer. In the writing of this work he had discovered the dramatic absurdities of the form, 【61】 in his next work, "The Flying Dutchman," he attempted his first important use of the "leit motif," or characteristic 【62】 , for his different personages , and also used these themes, in anticipation of the advent of his characters, in a manner he later described as" making the audience a part of the being. 【63】 his way to Dresden to conduct" Rienzi," Wagner visited the Wartburg Castle, and there he became familiar 【64】 the legendary stories which he used in all his later works. "Tannhauser" gives an actual description of the Minnesinger Knights, who inspired Wagner 【65】 Teutonic versions of "The Ring of the Nibelungs", "Lohengrin" ,"Tristan and Isolde" and "Parsifal".

单选题They gave {{U}}on-the-spot{{/U}} broadcast while the performance was in process on the stage. A. live B. living C. lively D. alive

单选题The desk was a chaos of papers and unopened letters.

单选题We are wasting precious time sitting around here.A. valuableB. leisureC. spareD. previous

单选题"Salty" Rice Plant Boosts Harvests 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 (浸透) 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.

单选题下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。 How a Terrible Battle Helped to Change Europe Ninety years ago on a sunny morning in Northern France，something happened that changed Britain and Europe for ever．At half past seven on the morning of July 1，1916，whistles blew and thousands of British soldiers{{U}} (51) {{/U}}their positions to attack their German enemies．{{U}} (52) {{/U}}the end of the day，20，000 of them were dead，and another 30，000 wounded or missing．The Battle of the Somme，{{U}} (53) {{/U}}it is called，lasted for six months．When it ended，125，000British soldiers were dead．They had gained five kilometers of ground． This was one of a series of great battles during the WWI. The{{U}} (54) {{/U}}on the Somme was staged to relieve pressure on the French，who were{{U}} (55) {{/U}}in a great battle of their own at a place called Verdun．By the time the battle ended，over a million French and German troops had been killed． About 17 million people were killed in WWI．There have been wars with greater numbers of dead．But there has never been one{{U}} (56) {{/U}}most of the dead were concentrated in such a small area．On the Somme battlefield，two men died for every metre of space． Local farmers working in the land still{{U}} (57) {{/U}}the bodies of those who died in that battle．The dead of all nations were buried in a series of giant graveyards{{U}} (58) {{/U}}the line of the border between France and Belgium．Relatives and descendants(后代) of those who died still{{U}} (59) {{/U}}these graveyards today． It took a second great conflict before Europe was to{{U}} (60) {{/U}}against war itself．Twenty-eight years after the Somme battle，a liberating army of British，American and Canadian troops took{{U}} (61) {{/U}}France from another German invasion．More than 500，000 people were killed．New graveyards were built． Two great conflicts across two generations helped to change the European{{U}} (62) {{/U}}about war．Germany，once the most warlike country in Europe，is now probably more in favor of peace than any other．One major{{U}} (63) {{/U}}of war in Europe was rivalry(竞争) between France and Germany．The European Union was specifically formed to{{U}} (64) {{/U}}that rivalry． The last British veteran(老兵) of the Somme battle died in 2005，aged 108．And the WWI is passing out of{{U}} (65) {{/U}}and into history．But for anyone who wants to understand how Europeans think，it is still important to know a little about the terrible events of July 1,1916．

单选题Do not waste time on insignificant points.

单选题At an early age he showed a talent for music.A. qualityB. characterC. abilityD. gene

单选题Children who are over-protected by their parents may become {{U}}mollycoddled{{/U}}.

单选题 Football Football is, suppose, the most popular game in England: one has only to go to one of the important matches to see this. Rich and poor, young and old, one can see them all there, shouting and cheering for one side or the other. One of the most surprising things about football in England to a stranger is the great knowledge of the game which even the smallest boy seems to have. He can tell you the names of the players in most of the important teams. He has photographs of them and knows the results of a large number of matches. He will tell you, with a great air of authority, who he expects will win such and such a match, and his opinion is usually as valuable as that of men three or four times his age. Most schools in England take football seriously - much more seriously than nearly all European schools, where lessons are all-important (至关重要的), and games left for private arrangements. In England, it is believed that education is not only a matter of filling a boy's mind with facts in a classroom; education also means character training; and one of the best ways of training character is by means of games, especially team games, where the boy has to learn to work with others for his team, instead of working selfishly (自私地) for himself alone. The school therefore arranges games and matches for its pupils. Football is a good team game, it is good exercise for the body, it needs skill and a quick brain, it is popular and it is cheap: as a result, it is the school's favorite game in the winter.

单选题Its evident that her handling of them has bruised the peaches.

单选题When We Are Asleep Everyone dreams, but some people never recall their dreams, or do so very rarely. Other people always wake up with vivid recollections (记忆) of their dreams, though they forget them very quickly. In an average night of eight hours" sleep, an average adult will dream for around one hundred minutes, probably having three to five dreams, each lasting from ten to thirty minutes. Scientists can detect when someone is having a dream by using an instrument which measures the electrical waves in the brain. During dreaming, these waves move more quickly. Breathing and pulse rate also increase, and there are rapid eye movements under the lids, just as though the dreamer were really looking at moving objects. These signs of dreaming have been detected in all mammals (哺乳动物) studied, including dogs, monkeys, cats and elephants, and also some birds and reptiles (爬行动物).This period of sleep is called the "D" state for around 50% of their sleep; the period reduces to around 25% by the age of 10. Dreams take the form of stories, but they may be strange and with incidents not connected, which make little sense. Dreams are seldom without people in them and they are usually about people we know. One estimate says that two-thirds of the "cast" of our dream dramas are friends and relations. Vision seems an essential part of dreams, except for people blind from birth. Sound and touch senses are also often aroused, but smell and taste are not frequently involved. In "normal" dreams, the dreamer may be taking part, or be only an observer. But he or she cannot control what happens in the dream. However, the dreamer does have control over one type of dream. This type of dream is called a "lucid" (清醒的) dream. Not everyone is a lucid dreamer. Some people are occasional lucid dreamers. Others can dream lucidly more or less all the time. In a lucid dream, the dreamer knows that he is dreaming.