数列{an}的前n项和为Sn，则S5＝5/6。

A．条件（1)充分，但条件（2)不充分。
B．条件（2)充分，但条件（1)不充分。
C．条件（1)和（2)单独都不充分，但条件（1)和条件（2)联合起来充分。
D．条件（1)充分，条件（2)也充分。
E．条件（1)和（2)单独都不充分，条件（1)和条件（2)联合起来也不充分。

We sometimes hear that essays are an old-fashioned form, that so-and-so is the "last essayist", but the facts of the marketplace argue quite otherwise. Essays of nearly any kind are so much easier than short stories for a writer to sell, so many more see print, it's strange that though two fine anthologies （collections) remain that publish the year's best stories, no comparable collection exists for essays. Such changes in the reading public's taste aren't always to the good, needless to say. The art of telling stories predated even cave painting, surely; and if we ever find ourselves living in caves again, it （with painting and drumming) will be the only art left, after movies, novels, photography, essays, biography, and all the rest have gone down the drain--the art to build from.
Essays, however, hang somewhere on a line between two sturdy poles: this is what I think, and this is what I am. Autobiographies which aren't novels are generally extended essays, indeed. A personal essay is like the human voice talking, its order being the mind's natural flow, instead of a systematized outline of ideas. Though more changeable or informal than an article or treatise, somewhere it contains a point which is its real center, even if the point couldn't be uttered in fewer words than the essayist has used. Essays don't usually boil down to a summary, as articles do, and the style. of the writer has a "nap" to it, a combination of personality and originality and energetic loose ends that stand up like the nap （绒毛) on a piece of wool and can't be brushed flat. Essays belong to the animal kingdom, with a surface that generates sparks, like a coat of fur, compared with the flat, conventional cotton of the magazine article writer, who works in the vegetable kingdom, instead. But, essays, on the other hand, may have fewer "levels" than fiction, because we are not supposed to argue much about their meaning. In the old distinction between teaching and storytelling, the essayist, however cleverly he tries to conceal his intentions, is a bit of a teacher or reformer, and an essay is intended to convey the same point to each of us.
An essayist doesn't have to tell the whole truth and nothing but the truth, he can shape or shave his memories, as long as the purpose is served of explaining a truthful point. A personal essay frequently is not autobiographical at all, but what it does keep in common with autobiography is that, through its tone and tumbling progression, it conveys the quality of the author's mind. Nothing gets in the way. Because essays are directly concerned with the mind and the mind's peculiarity, the very freedom the mind possesses is conferred on this branch of literature that does honor to it, and the fascination of the mind is the fascination of the essay.
According to the passage the changes in readers' taste ______.
A．contribute to the incompatibility of essays with stories
B．often result in unfavorable effect, to say the least
C．sometimes come to something undesirable, of course
D．usually bring about beneficial outcome, so to say

某个实验把一批吸烟者作为对象，分为两组：第一组是实验组，第二组是对照组。实验组的成员被强制戒烟，对照组的成员不戒烟。三个月后，实验组成员的平均体重增加了10%，而对照组成员的平均体重基本不变。实验结果说明，戒烟会导致吸烟者的体重增加。以下哪项如果为真，最能加强上述实验结论的说服力？
A．实验组和对照组成员的平均体重基本相同。
B．实验组和对照组的人数基本相同。
C．除戒烟外，对于每个实验对象来说，可能影响体重变化的生存条件基本相同。
D．除戒烟外，对于每个实验对象来说，可能影响体重变化的生存条件基本保持不变。
E．上述实验的设计者，是著名的保健专家。

In some underdeveloped areas of the world, sick people go to a witch or priest instead of doctors for
A．treatment
B．cure
C．heal
D．care

Now medical researchers are discovering a truism: "alcohol and tobacco do not mix." These two substances, both dangerous to health, act synergistically, each making the other more powerful and thereby causing worse damage than either would do alone.
Because of this interaction, the person who both smokes and drinks heavily may be at a greater risk of becoming ill than one who drinks like a fish, but never smokes or who smokes like a chimney, but never drinks. To get an idea of how this synergism may work, consider what happens when a smoker lights up a cigarette. With each puff he inhales at least 4,000 different chemicals. These include toxic hydrogen-cyanide, carbon monoxide and nitrogen-dioxide gases, and four dozen compounds such as benzo pyrene and radioactive polonium 210 . All are known as carcinogens. Most chemical vapors in tobacco smoke get deposited in the mouth, nose, throat and lungs in a coating called tar. It is in this tar that most of the cancer--inducing potential of tobacco smoke lies. Then in a scenario typical of chronic heavy drinkers--most of whom also smoke--our smoker feels thirsty and washes down that smoke coating in his mouth and throat with whisky. The alcohol in his drink is not in itself a carcinogen, but it may act as a solvent, dissolving the tar-taped tobacco poisons, and easing the transport of carcinogens across membranes.
Our smoker continues to drink. Soon he lights another cigarette and inhales deeply. Behind his embattled lungs, meanwhile, his liver has gone on full alert to save his life. The three-pound chemical factory, which cleans most toxins from the bloodstream, reacts to alcohol as a foreign substance and metabolizes 95 percent of it into other chemicals. But in turning its energy to clearing just one-half ounce of pure alcohol--the amount in a standard drink--per hour from our drinking smoker's blood, the liver's other metabolic functions suffer a sharp decrease. Poisons from tobacco smoke that otherwise would be removed from his blood within minutes are now allowed to flood his body for hours or days, depending on how much alcohol the liver must dispose of.
The person who smokes one or two packs of cigarettes a day loses on average six to eight percent of his blood's oxygen carrying capacity. If our heavy smoker's use of alcohol has led to alcoholism, he is probably malnourished. This malnourishment compounds problems he is having with insufficient oxygen. His brain cells are dying from it.
The synergistic effect of alcohol and tobacco may deliver a powerful blow to the cardiovascular system as well as the upper respiratory tract. For those prone to hypertension who drink more than two ounces of alcohol a day, high blood pressure is common and with it the increased risk of stroke and heart attack. For hypertensives who combine smoking and drinking, the risks are even greater.
Which of the following can be the best title of this passage？
A．Dead Mixer=Alcohol+ Tobacco.
B．Alcohol and Tobacco Are Dangerous to Health.
C．Tobacco Contains a Lot of Toxic Compounds.
D．Interaction of the Alcohol and Tobacco.

人们总是这样问律师：“你明知道罪犯有罪，为什么还真诚地为他辩护？”律师答道：“我这样做是为了维护法律赋予被告的合法权利，这对于实施法律的公正是必不可少的”。从律师的回答中，能得出以下哪项结论？
Ⅰ．被告即使是真正的罪犯，也拥有法律赋予的合法权利。
Ⅱ．只要维护被告，包括真正的罪犯的合法权利，就能保证实施法律的公正。
Ⅲ．如果剥夺那些明显是罪犯的被告的一切权利，那么就不能保证实施法律的公正。
A．仅仅Ⅰ。
B．仅仅Ⅰ和Ⅱ。
C．仅仅Ⅰ和Ⅲ。
D．仅仅Ⅱ和Ⅲ。
E．Ⅰ、Ⅱ和Ⅲ。