单选题The texture of the soil depends on the relative amounts of different-sized particles that combine to make up the soil. These particles can be as large as stone and gravel or as small as clay. A typical clay soil is composed of approximately 60 percent actual clay, 20 percent silt, and 20 percent sand. The particles in a sandy soil are so fine that it tends to be compact and interferes with the oxygen supply for plant roots. Water has trouble entering this impervious soil, and runoff is very common during rainfalls. A typical light sandy soil is composed of approximately 70 percent sand, 20 percent silt, and 10 percent clay. The particles in a sandy soil are comparatively large, permitting water to enter the soil and to pass through it so quickly that it often carries nutrients with it and dries out very rapidly. The texture of sandy soils is generally very difficult to modify because huge amounts of organic material must be added. A typical loam soil is composed of approximately 40 percent sand, 40 percent silt, and 20 percent clay, making it an ideal garden soil. It is easily worked and retains water and nutrients, which are slowly absorbed by plant roots. A typical adobe soil is a clay soil present in hot, dry areas of the country and is often very hard and cracked. It has all the disadvantages of a heavy clay soil and, being much drier, is more difficult to correct.

单选题The singer on the stage has a young ______ face and a voice of an ______. A. boy…angel B. boy's…angel C. boy…angel's D. boy's…angel's

单选题It is supposed that about half of the varieties of fish living in the dark depths have ______.

单选题The terrorists might have planted a bomb on the plane in Athens, set to______when it arrived in New York.

单选题The author advises teachers to ______.

单选题The chief ______ of that young man are his generosity and energy.

单选题He wasn't appointed chairman of the committee, ______ not very popular with all its members.(2014年厦门大学考博试题)

单选题The Tacoma's executive director and three port commissioners will be in China next week to ______advice from world port experts on improving inland transportation systems. A. discriminate B. disperse C. differentiate D. glean

单选题Total investments for this year reached $ 56 million, and to put this into ______ investments this year will double those made in 1997.

单选题Whenever a rattlesnake is Uagitated/U, it begins to move its tail and make a rattling noise.

单选题Brazilian music is thoroughly imbued with African themes, and {{U}}illustrious{{/U}} composers have long found inspiration in the black musical heritage.

单选题According to the passage, the best word to describe America in the 1930s would be ______.

单选题The politician tried to{{U}} convince {{/U}}the voters that he was the man for the job.

单选题Seventeen-year-old Quantae Williams doesn't understand why the U. S. Supreme Court struck down his school district's racial diversity program. He now (61) the prospect of leaving his mixed-race high school in suburban Louisville and (62) to the poor black downtown schools where he (63) in fights. "I'm doing (64) in town. They should just leave it the (65) it is," said Williams, using a fond nickname for suburban Jeffersontown High School, (66) he's bused every day from his downtown neighborhood. "Everything is (67) , we get along well. If I go where all my friends go, I'll start getting in trouble again," Williams said as he took a (68) from his summer job (69) clothing (70) for poor families. Last month's 5-4 ruling by the Supreme Court struck down programs that were started voluntarily in Louisville and Seattle. The court's decision has left schools (71) the country (72) to find a way to protect (73) in their classrooms. Critics have called the decision the biggest (74) to the ideals of the 1954 Brown vs. Board of Education (75) , which outlawed racial segregation in U. S. public schools. With students already (76) to schools for the (77) year that begins in September, (78) will be immediately affected by the Supreme Court decision. In Jefferson County, officials said it could be two years (79) a new plan is (80) place, leaving most students in their current schools.

单选题According to the International Bank for Reconstruction and Development in 1995, the wealthiest 10 percent of China's population received 9 percent of the income, while the poorest 10 percent received only 2 percent. Such ______ in income and wealth are found in both cities and rural areas.

单选题Hunting for a job late last year, lawyer Gant Redmon stumbled across Career Builder, a job database on the Internet. He searched it with no success but was attracted by the site"s "personal search agent". It"s an interactive feature that lets visitors key in job criteria such as location, title, and salary, then e-mail them when a matching position is posted in the database. Redmon chose the key words legal, intellectual property, and Washington , D. C. Three weeks later, he got his first notification of an opening. "I struck gold," says Redmon, who e-mailed his resume to the employer and won a position as in-house counsel for a company. With thousands of career-related sites on the Internet, finding promising openings can be time consuming and inefficient. Search agents reduce the need for repeated visits to the databases. But although a search agent worked for Redmon, career experts see drawbacks. Narrowing your criteria, for example, may work against you, "Every time you answer a question, you eliminate a possibility," says one expert. For any job search, you should start with a narrow concept what you think you want to do— then broaden it. "None of these programs do that," says another expert. "There"s no career counseling implicit in all of this." Instead, the best strategy is to use the agent as a kind of tip service to keep abreast of jobs in a particular database; when you get an e-mail, consider it a reminder to check the database again. "I would not rely on agents for finding everything that is added to a database that might interest me," says the author of a job-searching guide. Some sites design their agents to tempt job hunters to return. When Career Site"s agent sends out messages to those who have signed up for its service, for example, it includes only three potential jobs—those it considers the best matches. There may be more matches in the database; job hunters will have to visit the site again to find them—and they do. "On the day after we send our messages, we see a sharp increase in our traffic," says Seth Peets, vice president of marketing for Career Site. Even those who aren"t hunting for jobs may find search agents worthwhile. Some use them to keep a close watch on the demand for their line of work or gather information on compensation to arm themselves when negotiating for a raise. Although happily employed, Redmon maintains his agent at Career Builder. "You always keep your eyes open," he says. Working with a personal search agent means having another set of eyes looking out for you.

单选题They have been arrested as suspected drug______.

单选题The man who invented Coca-Cola was not a native Atlantan, but on the day of his funeral every drugstore in town testimonially shut up shop. He was John Styth Pemberton, born in 1831 in Knoxville, Georgia, eighty miles away. Sometimes known as Doctor, Pemberton was a pharmacist who, during the Civil War, led a cavalry troop under General Joe Wheeler. He settled in Atlanta in 1869, and soon began brewing such patent medicines as Triplex Liver Pills and Globe of Flower Cough Syrup. In 1885, he registered a trademark for something called French Wine Coca—Ideal Nerve and Tonic Stimulant; a few months later he formed the Pemberton Chemical Company and recruited the services of a bookkeeper named Frank M. Robinson, who not only had a good head for figures but, attached to it, so exceptional a nose that he could audit the composition of a batch of syrup merely by sniffling it. In 1886—year in which, as contemporary Coca-Cola officials like to point out, Conan Doyle unveiled Sherlock Holmes and France unveiled the Statue of Liberty—Pemberton unveiled a syrup that he called Coca-Cola. It was a modification of his French Wine Coca. He had taken out the wine and added a pinch of caffeine, and, when the end product tasted awful, had thrown in some extract of cola nut and a few other oils, blending the mixture in a three-legged iron pot in his back yard and swishing it around with an oar. He distributed it to soda fountains in used beer bottles, and Robinson, with his flowing bookkeeper's script, presently devised a label, on which "Coca-Cola" was written in the fashion that is still employed. Pemberton looked upon his mixture less as a refreshment than as a headache cure, especially for people whose headache could be traced to over-indulgence. On a morning late in 1886, one such victim of the night before dragged himself into an Atlanta drugstore and asked for a dollop of Coca-Cola. Druggists customarily stirred a tea-spoonful of syrup into a glass of water, but in this instance the man on duty was too lazy to walk to the fresh-water tap, a couple of feet off. Instead, he mixed the syrup with some soda water, which was closer at hand. The suffering customer perked up almost at once, and word quickly spread that the best Coca-Cola was a fizzy one.