单选题We expect Mr. Smith will ______ Class One when Miss White retires.

单选题You should ______ to one or more weekly magazines such as Time, or People.

单选题When squashed the stem and leaves of the jewelweed exude a juice that will soothe some skin irritations.

单选题Among the first to come and live in North America______, who later prospered mainly in New England.

单选题Uniform acceleration occurs ______ the rate of change remains the same over successive and equal intervals of time.

单选题Texas, the second largest state of America, is ______ in natural resources.

单选题The Supreme Court issued a {{U}}unanimous{{/U}} decision in this case. A. disguised B. resounding C. partially agreed D. well agreed

单选题How high will you ______her among the singers of this country?

单选题The contemporary botanical garden has many urgent tasks, the conservation of plant resources being paramount .

单选题Rebecca ______ me earlier if she did not like her house she bought last month.

单选题The temperature of the sun is over 5, 000 degrees Fahrenheit at the surface, but it rises to perhaps more than 16 million degrees at the center. The sun is so much hotter than the earth that matter can exist only as a gas, except at the core. In the core of the sun, the pressures are so great against the gases that, despite the high temperature, there may be a small solid core. However, no one really knows, since the center of the sun can never be directly observed. Solar astronomers do know that the sun is divided into five layers or zones. Starting at the outside and going down into the sun, the zones are the corona, chromosphere, photosphere, convection zone and finally the core. The first three zones are regarded as the sun's atmosphere. But since the sun has no solid surface, it is hard to tell where the atmosphere ends and the main body of the sun begins. The sun's outermost layer begins about 10, 000 miles above the visible surface and goes outward for millions of miles. This is the only part of the sun that can be seen during an eclipse such as the one in February 1979. At any other time, the corona can be seen only when special instruments are used on cameras and telescopes to shut out the glare of the sun's rays. The corona is a brilliant, pearly white, filmy light, about as bright as the full moon. Its beautiful rays are a sensational sight during an eclipse. The corona's rays flash out in a brilliant fan that has wispy spikelike rays near the sun's north and south poles. The corona is thickest at the sun's equator. The corona rays are made up of gases streaming outward at tremendous speeds and reaching a temperature of more than 2 million degrees Fahrenheit. The rays of gas thin out as they reach the space around the planets. By the time the sun's corona rays reach the Earth, they are weak and invisible.

单选题An allowance is an important tool for teaching kids how to budget, save and make their own decisions. Children remember and learn from mistakes when their own dollars are lost or spent foolishly. How large an allowance is appropriate? Experts say there is not a right amount. Actual amounts differ from region to region, and from family to family. To set an appropriate allowance for your child, work up a weekly budget. Allow for entertainment expenditures such as movies and snacks. Next, include everyday expenses such as lunch money, bus fare, and school supplies. "If you make the child responsible for these bills," says Josephine Swanson, a consumer specialist, "he or she will learn to budget for necessary expenditures." Finally, add some extra money to make saving possible. If you can, keep your child"s allowance in line with that of his friends. A child whose purchasing power falls away below his peers" can feel left out. It can be tough, but avoid excusing your children when they make a mistake with their allowance. When Brooke Stephens was ten and growing up in Jacksonville, her mother gave her $5 a week, $1.75 of which was for bus fare and lunch. "If you lose your money," Brooke"s mother told her, "you walk home" One week the girl spent all her allowance in a candy store, then she called home for a ride. "Morn made me walk home," recalls Stephens, now a financial planner in Brooklyn. "At first I was angry. But I finally realized that she was trying to teach me an important lesson." Experts advise that an allowance should not be tied directly to a child"s daily chores. Kids should help around the house not because they get paid for it but because they share responsibilities as members of a family. You might, however, pay a child for doing extra jobs at home, which can develop his or her initiative.

单选题Mr. Johnson was a passionate person filled with an incredible dynamism .

单选题Have you anything to say ______ the proposal of taking immediate actions?

单选题It is common today to identify, in some way, with one side of the brain. You may think, for example, that you are more "right brain" than "left". When we make such statements, we are referring to the fact that the two halves of the human brain deal with information from the senses, and hence the world, in different ways. In general, the left hemisphere is responsible for our processing of language and logic and the right deals with aspects of thought like emotions and spatial relationships. The hemispheres also control our movements, though the left hemisphere controls the right side of our bodies, and vice versa. The fact that the two hemispheres of the brain work in different ways on different tasks is a relatively new discovery. That discovery was made by a psychobiologist named Roger Sperry and it won him a Nobel Prize in 1981. Sperry uncovered the inner workings of normal brains by studying the brain function of people who had a certain kind of brain damage. In most brains, the two halves are connected by the corpus callosum, a bundle of millions of nerves, which serves as a "bridge" of sorts between the two hemispheres, allowing them to communicate with each other. The people Sperry studied had had their corpus callosa cut, and because of this, their left and right brains couldn"t exchange information. In a famous experiment, Sperry showed one such subject two pictures. The subject saw a picture of a knife with his right eye(controlled by the left brain)and a picture of a spoon with his left eye(controlled by the right brain). When asked to name what he saw, the subject said knife, because it is the left brain that deals with language and the naming of things. However, when asked to reach over with his left hand to a nearby table on which was placed both a knife and a spoon, and choose, without looking, the object he saw, the subject chose the spoon. This is because his left eye(controlled by the right brain)saw the spoon and his left hand(also controlled by the right brain)chose this rather than the knife. The subject himself was not at all conscious of the fact that he was seeing and choosing two different objects.

单选题The ______ outcome of the contest varies from moment to moment.

单选题What the government should do urgently is to take actions to ______ the economy.

单选题Passage Four Read the passage below and then do the exercises that follow. If a Mecca exists for today's youth, it must take the form of a rock concert. Such a colossal event draws people from surprisingly distant places and from oddly diverging lifestyles. The sophisticated college student may be seated next to the wide-eyed junior high cheerleader, the latter showing fright at the approach of a wild-eyed freak. How do these incompatible character types find a mutual appeal in rock concert? What induces young people to exchange the few dollars earned through babysitting or car washing for a concert ticket? To many, the answer is immediately obvious—the music is the source of appeal at a concert. The quality of the sound produced, however, frequently casts doubt on this explanation. Unquestionably, rock concertsare loud ; the decibel level of some reportedly exceeds that attained by a jet plane on takeoff. In addition, this aural assault is often intensified by an out-of-tune guitar, by the faltering voice of the performer, or by the bad acoustic in the concert hall. Rock groups generally correct these problems in a studio; their recordings may even boast pleasing harmonies with intelligible lyrics. So why do we battle crowds to secure choice seating at a concert? A concert creates a magical, otherworldly atmosphere, reminiscent of a childhood never-never land. An eerie darkness shrouds the hall, and then, just as in our favorite fairy tale, the supernatural being( otherwise identified by the vulgar term, "rock star") appears in a burst of light. In another context he would have been known as a" god out of the machine. " Bizarre lighting schemes and gimmicks such as mock hangings or fire-breathing contribute to the atmosphere of other-worldliness in some acts. The fans are permitted only a glimpse of the star before he vanishes once more in the darkness, only to materialize the following evening in a concert hall hundreds of miles away. The stage becomes the rock star's only natural habitat; for us, he can have no existence apart from it. We can scarcely conceive of our idols performing such mundane activities as going to the dentist, shopping for tuna fish, or changing the baby, perhaps we have a need to believe in an illusory creature of the night, somehow different from ourselves. Who fits this description better than a rock star?

单选题After a period of probation a______becomes a nun.

单选题He built up the business______his health.