单选题What dreadful weather we have these days!A. terribleB. wonderfulC. niceD. cold

单选题We"ve seen a marked shift in our approach to the social issues.

单选题They had a far better yield than any other farm miles away around this year.

单选题{{B}}第二篇{{/B}} Ancient Egypt Brought Down by Famine Even ancient Egypt's mighty pyramid (金字塔) builders were powerless in the face of the famine (饥荒) that helped bring down their civilization around 2180 B.C. Now evidence collected from mud deposited by the River Nile suggests that a shift in climate thousands of kilometers to the south was ultimately to blame—and the same or worse could happen today. The ancient Egyptians depended on the Nile's annual floods to irrigate their crops. But any change in climate that pushed the African monsoons (季风) southwards out of Ethiopia would have reduced these floods. Declining rains in the Ethiopian highlands would have meant fewer plants to stabilize the soil. When rain did fall it would have washed large amounts of soil into the Blue Nile and into Egypt, along with sediment (沉积) from the White Nile. Blue Nile mud has a different isotope (同位素) signature from that of the white Nile, so by analyzing isotope differences in mud deposited in the Nile Delta, Michael Krom of Leeds University worked out what proportion of sediment came from each branch of the river. Krom reasons that during periods of drought, the amount of Blue Nile mud in the river would he relatively high. He found that one of these periods, from 4500 to 4200 years ago, immediately came before the fall of the Egypt's old Kingdom. The weakened waters would have been disaster for the Egyptians. "Changes that affect food supply don't have to be very large to have a ripple (波浪) effect in societies, "says Bill Ryan of the Lamont Doherty Earth Observatory in New York. Similar events today could be even more devastating, says team member Daniel Stanley, A scientist from the Smithsonian Institution in Washington D. C. "Anything humans do to shift the climate belts would have an even worse effect along the Nile system today because the populations have increased dramatically. "

单选题It is always praiseworthy to admit one"s errors and rectify them without delay.

单选题{{B}}第二篇{{/B}} {{B}}One-room Schools{{/B}} One-room schools are part of the heritage of the United States, and the mention of them makes people feel a vague longing for "the way things were." One-room schools are an endangered species, however. For more than a hundred years, one-room schools have been systematically shut down and their students sent away to centralized schools. As recently as 1930 there were 149,000 one-room schools in the United States. By 1970 there were 1,800. Today, of the nearly 800 remaining one-room schools, more than 350 are in Nebraska. The rest are scattered through a few other states that have on their road maps wide-open spaces between towns. Now that there are hardly any left, educators are beginning to think that maybe there is something yet to be learned from one-room schools, something that served the pioneers that might serve as well today. Progressive educators have come up with progressive-sounding names like "peer-group teaching" and "multi-age grouping" for educational procedures that occur naturally in the one-room schools. In a one-room school the children teach each other because the teacher is busy part of the time teaching someone else. A fourth grader can work at a fifth-grade level in math and a third-grade level in English without the stigma associated with being left back or the pressures of being skipped ahead. A youngster with a learning disability can find his or her own level without being separated from the other pupils. In larger urban and suburban schools today, this is called "mainstreaming." A few hours in a small school that has only one classroom and it becomes clear why so many parents feel that one of the advantages of living in Nebraska is that their children have to go to a one-room school.

单选题The shrapnel maimed the young soldier.

单选题In the background was that eternal hum.

单选题Look on the Bright Side Do you ever wish you were more optimistic, someone who always (51) to be success- ful? Having someone around who always (52) the worst isn't really a lot of (53) . We all know someone who sees a single cloud on a sunny day and says, "It looks (54) rain. " But if you catch yourself thinking such things, it's important to do something (55) it. You can change your view of life, (56) to psychologists. It only takes a little effort, and you'll find life more rewarding as a (57) Optimism, they say, is partly about self-respect and confidence, but it's also a more positive way of looking at life and all it has to (58) Optimists are more (59) to start new projects and are generally more prepared to take risks. Upbringing is obviously very important in forming your (60) to the world. Some people are brought up to (61) too much on others and grow up forever blaming other people when anything (62) wrong. Most optimists, on the (63) hand, have been brought up not to (64) failure as the end of the world--they just (65) with their lives.

单选题They have {{U}}given up{{/U}} the hope to save their friend from drowning. A. ended B. abandoned C. built D. strengthen

单选题My investment in that company can no longer be {{U}}depended on{{/U}} as a source of income.

单选题He speaks Spanish fairly well.A. quiteB. perfectlyC. alwaysD. hardly

单选题It"s almost 5 o"clock,time to quit .

单选题 阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从 4个选项中选择1个最佳答案。 {{B}} Less Is More{{/B}} It sounds all wrong—drilling holes in a piece of wood to make it more resistant to knocks. But it works because the energy from the blow gets distributed throughout the wood rather than focusing on one weak spot. The discovery should lead to more effective and lighter packaging materials. Carpenters have known{{U}} (51) {{/U}}centuries that some woods are tougher than others. Hickory (山核桃木), for example, was turned into axe handles and cartwheel spokes (轮辐) because it can absorb shocks without breaking. White oak, for example, is much more easily damaged,{{U}} (52) {{/U}}it is almost as dense. Julian Vincent at Bathe University and his team were convinced the wood's internal structure could explain the differences. Many trees have tubular (管的) vessels that run{{U}} (53) {{/U}}the trunk and carry water to the leaves. In oak they are large, and arranged in narrow bands, but in hickory they are smaller, and more evenly distributed. The researchers{{U}} (54) {{/U}}this layout might distribute a blow's energy throughout the wood, soaking up a bigger hit. To test the idea, they drilled holes 0.65 millimetres across into a block of spruce (云杉), a wood with{{U}} (55) {{/U}}vessels, and found that{{U}} (56) {{/U}}withstood a harder knock.{{U}} (57) {{/U}}when there were more than about 30 holes per square centimetre did the wood's performance drop off. A uniform substance doesn't cope well with knocks because only a small proportion of the material is actually{{U}} (58) {{/U}}. All the energy from the blow goes towards breaking the material in one or two places, but often the pieces left{{U}} (59) {{/U}}are pristine (未经破坏的). But instead of the energy being concentrated in one place, the holes provide many weak spots that all absorb energy as they break, says Vincent. "You are controlling the places{{U}} (60) {{/U}}the wood breaks, and it can then absorb more{{U}} (61) {{/U}}, more safely." The researchers believe the principle could be applied to any material—{{U}} (62) {{/U}}example, to manufacture lighter and more protective packaging. It could{{U}} (63) {{/U}}be used in car bumpers, crash barriers and armour for military vehicles, says Ulrike Wegst,{{U}} (64) {{/U}}the Max Plank Institute for Mental Research in Stuttgart. But she emphasizes that you{{U}} (65) {{/U}}to design the substance with the direction of force in mind. "The direction of loading is crucial," she says.

单选题The tree fell on the roof of a car and Ucrushed/U it.

单选题We should not sacrifice environmental protections to foster economic growth.

单选题A gift to the United States from France, the Statue of Liberty was assembled and dedicated in 1886.

单选题She was a {{U}}puzzle{{/U}}.

单选题Supplies were parachuted into the earthquake zone.

单选题The city has decided to do away with all the old buildings in its center.