单选题I took the medicine 10 minutes ago, but the bitterness is still ______ in my mouth.

单选题claustrophobia

单选题Which of the following is equal to x24 for all positive values of x? A. x12+x12 B. (-x12)-2 C. (x6)6 D. (x2)(x3)(x4) E. (x72)1/3

单选题As the graduation is drawing near, every student began to ______ his future. A. compensate B. contemplate C. jeopardize D. manifest

单选题Amazon today unveiled Dash Buttons, an easy way for customers to 1 select bulk goods 2 an internet-connected button, and yesterday 3 Home Services, an on-demand installation and handyman service. Combined, they show that the e-commerce giant has a clear understanding of how the Internet-of-things will 4 its business. And it isn"t going to be shy about capitalizing on connectivity to build its bottom line. Dash Buttons are an adaptation of Amazon"s 5 -controlled Dash ordering system that lets people speak to order new 6 items. So 7 Amazon has is a retrofit strategy for connecting smart appliances to its e-commerce operations and a future-facing strategy for the coming flood of 8 devices. And all of this is geared around making buying products from Amazon as easy as possible. The 9 of one-button tasks are appealing, 10 it could lead to a 11 of packages ending up at people"s doors if Amazon doesn"t try to 12 waste on its end, by grouping shipments together when possible. People on Twitter seem mostly 13 about pets and small children playing with the Dash Buttons and ordering multiples of their Kraft Macaroni and Cheese boxes, although Amazon notes that 14 the button is pressed more than once, the order doesn"t go 15 on the second time, and you"ll get a smartphone notification about it. Amazon also recently launched Home Services, following up on last year"s opening of a home automation e-store devoted to connected gadgets for the home—many of which require a 16 installer. So now Amazon can sell these devices along with the person who can install them. It also is 17 on maintenance, via a network of service providers that it can call 18 for its network of suppliers or for its own planned connected home play. With Dash, it"s 19 an offensive play to 20 up more sales as devices come online. With Amazon Home Services, it"s making a defensive play as other large companies try to become more vertically integrated.

单选题Two dogsled teams raced across a 300-mile course in Wyoming. Team A finished the course in 3 fewer hours than did team B. If team A's average speed was 5 miles per hour greater than that of team B, what was team B's average speed, in miles per hour? A. 12 B. 15 C. 18 D. 20 E. 25

单选题Ifx,y,andwarenonzeronumbersandx-y=w,whichofthefollowingisequalto1?

单选题Imagine fishermen walking down to the seashore, ready to carry out their early morning routine of preparing their boats and net. 1 they hope for a good catch of fish. But to their 2 , a horrible sight meets their still sleepy eyes. Thousands of fish have been washed 3 dead. The cause of this mass destruction? A red tide! Red tides are a global 4 . They have been observed on both the Atlantic and the Pacific coasts of the United States and Canada. They have also 5 in many other places. Though relatively few people are 6 them, red tides are not new. In the Philippines, a red tide was first seen in the province of Bataan in 1908. Since then, red tides have been seen in many other 7 A Philippines red tide expert told us that " 8 the fish kills, the Philippines has documented 1,926 cases of dead shellfish poisoning caused by red tides." The term "red tide" 9 the discoloration of water that sometimes occurs in certain areas of the ocean or sea. Although the color is often red, it may also be 10 of brown or yellow. The World Book Encyclopedia reports that "the discolored areas may range from 11 a few square yards to more than 2,600 square kilometers." What causes such discoloration? Red tides are generally caused by several 12 of single-celled organisms. These tiny organisms have hair-like projections which they use to 13 themselves in water. There are about 2,000 varieties of these organisms, 30 of which carry poisonous 14 These minute organisms usually stay in warm waters with high content of salt. A red tide occurs when there is a sudden and rapid 15 of these organisms. The concentration of these organisms may 16 to 50,000,000 per quart of water! Although scientists do not fully understand why this happens, it is known that these organisms 17 when certain conditions simultaneously affect the water. These include abnormal weather, 18 temperatures, an oversupply of nutrients in the water, a generous 19 sunlight, and favorable water currents. When a heavy rainfall occurs, minerals and other nutrients are sometimes washed 20 the land into coastal water. These nutrients can contribute to the breeding of the organisms. The result? Red tides!

单选题obsolescent

单选题The structured-inquiry process can be useful for

单选题A retailer sells 5 shirts. The first 2 he sells for $64 and $39. If the retailer wishes to sell the 5 shirts for an overall average price of over $50, what must be the minimum average price of the remaining 3 shirts? A. $49.00 B. $49.67 C. $50.00 D. $51.33 E. $55.50

单选题A pharmaceutical company tested a new diet drug over a two-month period. The test group of 100 dieters lost an average of five pounds per person during the first month, but gained an average of two pounds per person in the second month. All of the following could help explain the results of the experiment except: A. The second month of the test occurred during a holiday season, when people are more likely to gain weight. B. The diet drug has unpleasant side effects, causing many of the subjects to stop using the drug after the first month. C. The pharmaceutical company provided low-calorie diets to the test subjects in the first month, but let the dieters choose their own food in the second month. D. The pharmaceutical company selected for the test people who were 20 to 40 pounds over their ideal weights. E. The diet drug relies on a metabolic effect that loses efficacy the longer a person takes the drug.

单选题What might be the appropriate title of this passage?

单选题______ that carried the tradition of 19th-century American Realism to perhaps its highest level of achievement.

单选题The Japanese dollar-buying makes traders eager to ______dollars in fear of another government inter

单选题At three o'clock ______ a cold morning, he arrived here. A. in B. at C. on D. of

单选题The questions in this group are based on the content of a passage. After reading the passage, choose the best answer to each question. Answer all questions following the passage on the basis of what is stated or implied in the passage. Congressman Hastings has proposed that Congress should abolish the Electoral College system for electing the president and replace it with a system of direct popular election. The Electoral College system is flawed, he argues, because it runs directly counter to the democratic principle that every citizen's vote should count equally. Because of the winner-take-all system in which the candidate who receives the most popular votes in a state receives all of that state's electoral votes, the citizens who voted for the losing candidate are effectively disenfranchised from the national election, even if their candidate lost the state by only a handful of votes. Moreover, because each state's number of electors is the same as its number of members of Congress, the citizens of small states get a disproportionately larger vote than citizens of more populous states. In the 1988 election, for example, the combined voting-age population of the six least populous states--Alaska, Delaware, North Dakota, South Dakota, Vermont, and Wyoming--was 3,119,000. These six states held 21 electoral votes among them. Florida, with a voting-age population of 9,614,000, also had 21 electoral votes. Because of inequities of this nature, there have been four presidential elections in which the candidate who won the Electoral College actually lost the popular vote: 1824, 1876, 1888, and 2000. Congressman Markham has argued that Hastings's proposed changes are unnecessary and even dangerous. First of all, he argues, the Electoral College system, whatever its flaws, has resulted in a stable democratic government for more than 200 years, which shows that it is doing something right. Second, the winner-take-all system helps create decisive majorities in the Electoral College, thereby reducing the problem of disputed elections that we might see in the event of direct popular elections. Third, the current system of allocating electors helps protect the interests of small states, which would be largely neglected in favor of large states if the Electoral College were based entirely on population. Protecting these states' rights is essential to upholding the principle of federalism (in which the states and the federal government maintain distinct powers). When the Electoral College system was first formalized by the Twelfth Amendment in 1804, a direct popular vote would have been impossible to implement, and the Electoral College was probably the best way to approximate the will of the people. Advances in technology and communication, however, now mean that a direct popular vote would be as simple, if not simpler, to administer than the current Electoral College system. Alternative ways to reform the system would be to do away with the winner-take-all system of state electors, to base the numbers of electors strictly on state populations, or to have a direct popular election but to weight the votes from different states differently in order to preserve the influence of small states.

单选题Advertisement: The most flavorful olives in the world are kalamata olives. The more kalamata olives used to make a bottle of olive oil, the more flavorful the oil, and no company buys more kalamata olives than Zorba's Olive Oil. Therefore, when you buy Zorba's Olive Oil, you're buying the most flavorful olive oil available today. The reasoning presented in the advertisement is flawed because it overlooks the possibility that: A. Not all of Zorba's competitors use kalamata olives in their oil. B. Zorba's sells more olive oil than any other company. C. The most flavorful olive oil is not necessarily the best olive oil. D. Because of bulk discounts, Zorba's pays less per kilogram of kalamata olives than does its competitors. E. The number of kalamata olives harvested every year is far less than the number of Spanish olives harvested every year.

单选题Donna is a mountain biking enthusiast. One Saturday, she spent the morning biking up an uphill trail at an average speed of 20 kilometers per hour, and then returned by the same route in the afternoon at an average speed of 25 kilometers per hour. If the downhill trip in the afternoon took 3/4 of an hour less than the uphill trek in the morning, how many kilometers did Donna ride each way? A. 50 B. 55 C. 65 D. 70 E. 75

单选题The questions in this group are based on the content of a passage. After reading the passage, choose the best answer to each question. Answer all questions following the passage on the basis of what is stated or implied in the passage. Dear Sirs, Given all the coverage that the emergence of hybrid cars has received in your pages in recent months, your readers may be interested to learn that gasoline-electric hybrids are not a new phenomenon at all, but rather the latest incarnation of an idea that has been kicking around for over a century. Indeed, the hybrid car has been around almost as long as the automobile itself. At the turn of the twentieth century, as the automotive age dawned, three power-generating technologies competed for dominance: steam, gasoline, and electricity. In the year 1900, steam was well known as the power source of the industrial revolution, and electricity was widely regarded as the power source of the future, so it was not at all obvious that internal combustion engines burning a fractional distillate of crude petroleum would have any particular edge in this race for the powertrains of America. Indeed, when engineer H. Piper filed the first patent application for a gasoline-electric hybrid motor in 1905, his intention was to use the gas to give a little kick to his perfectly serviceable electric engine. His goal: an engine that could accelerate from 0 to 25 miles per hour in 10 seconds. Piper achieved his goal. Electric and hybrid-electric engines powered more than 35,000 vehicles sold in 1912. These cars were perfectly adequate for the time, but over the following decade they mostly disappeared from the market, through no fault of their own. The cause of their decline was the spectacular improvements in the cost and performance of gasoline-powered cars. An onslaught of fast and cheap internal combustion cars from Ford, General Motors, and Buick essentially buried the electric and electric-hybrid motors by the 1920s. Continuing performance improvements in internal combustion engines and inexpensive gas pretty much kept hybrids buried until the oil crises of 1973 and 1979 gave Americans a reason to start thinking about fuel efficiency. Engineers had the motivation to think about fuel-efficient hybrids, but they still lacked the means to make hybrids economically competitive with gas-powered cars, because the performance of gas-electric engines lagged far behind that of gas-powered engines in acceleration, top speed, and cruising range. Dramatic improvements in electronics and computer technology during the 1990s, however, finally made the hybrid a reality. Advances in battery performance and, most importantly, computer-guided electric power transfer created a car that could drive like a regular car, but do so on half the tank of gas. As another century dawns, perhaps we are entering into a new automotive age.