Another common type of reasoning is the search for causes and results.We want to know whether cigarettes really do cause lung cancer, what causes malnutrition, the decay of cities, or the decay of teeth.We are equally interested in effects: what is the effect of sulphur or lead in the atmosphere, of oil spills and raw sewage in rivers and the sea, of staying up late on the night before an examination? Causal reasoning may go from cause to effect or from effect to cause.Either way, we reason from what we know to what we want to find out.Sometimes we reason from an effect to a cause and then on to another effect.Thus, if we reason that because the lights have gone out, the refrigerator won't work, we first relate the effect (lights out) to the cause (power off) and then relate that cause to another effect (refrigerator not working).This kind of reasoning is called, for short, effect to effect.It is quite common to reason through an extensive chain of causal relations.When the lights go out we might reason in the following causal chain: lights out--power off--refrigerator not working--temperature will rise--milk will sour.In other words, we diagnose a succession of effects from the power failure, each becoming the cause of the next. Causes are classified as necessary, sufficient, or contributory.A necessary cause is one which must be present for the effect to occur, as combustion is necessary to drive a gasoline engine.A sufficient cause is one which can produce an effect unaided, though there may be more than one sufficient cause; a dead battery is enough to keep a car from starting, but faulty spark plugs or an empty gas tank will have the same effect.A contributory cause is one which helps to produce an effect but cannot do so by itself, as running through a red light may help cause an accident, though other factors -- pedestrians or other cars at the crossroads -- must also be present. In establishing or refuting a causal relation it is usually necessary to show the process by which the alleged cause... Your refrigerator is not working and you have found that the electric power has been cut off. The power failure is a _ A) necessary cause B) sufficient cause C) contributory cause D) none of them
B
(Question)
If you are looking for the place that has everything, there's only one place to visit, and that's New York. It's a whole world in a city. The World of Theatre: All of New York is a stage. And it begins with Broadway. Where else can you find so many hit shows in one place? Only in New York. The World of Music: Spend an evening with Beethoven at Lincoln Centre. Swing to the great jazz of Greenwich Village. Or rock yourself silly at the hottest dance spots found anywhere. The World of Art: From Rembrandt to Picasso. From Egyptian tombs to Indian teepees. Whatever kind of art you like, you'll find in New York. The World of Fine Dining: Whether it's roast Beijing duck in Chinatown, or the finest French coq au vin found anywhere, there's a world of great taste waiting for you in New York. The World of Sights: What other city has a statue of Liberty , a Rocketfeller Centre or a Bronx Zoo? Where else can you take a horse-drawn carriage through Central Park, only in New York. What the writer really wanted to do is to _ . A) try to persuade readers to pay a visit to New York B) give readers some information about New York C) supply readers some wonderful programmes in New York D) help readers to get a better understanding of New York
(Answer)
A
Ques:NEW YORK (AP) -- The investigation into the disappearance of 6-year-old Etan Patz has gone through decades and countries, from basements to rooftops and seemingly everywhere in between. No one has ever been charged criminally -- and the little boy with sandy brown hair and a toothy grin was declared dead in 2001. This week, the six-year-old boy who went missing from the Soho area of New York City in 1979 is back in the news. Police and the FBI are investigating a possible lead into the 33-year-old case of Etan Patz, the first missing child to appear on the side of a milk box. The child disappeared on the way to school on the morning of May 25, 1979. It was the first time he was allowed to walk the two blocks to the bus stop alone. A tip seemed to have led officials to the basement of a building on the corner of Prince and Wooster streets, about a block and a half from where Etan had lived with his family. The name Etan Patz has become a hot topic on Twitter as people _ . Shirley Brady noted: "As mom to a 6 years old in Soho, it's still held out by locals as cautionary tale ." Another wrote, "Boy who disappeared on his way to school in 1979 has been REOPENED! Crazy." One wondered, "Why is FBI and NYPD searching for a kid that disappeared in 1979?" Good question. This is a case that Stuart Gra Bois, as an assistant U.S. lawyer under Rudolph Giuliani, followed for years. It became the most famous missing-person case in New York City, turned a nationwide spotlight on missing children, and created headlines around the globe. No one was ever stated guilty of the crime. The case led to the creation of National Missing Children's Day, marked on May 25, the day the blond-haired, blue-eyed child went missing. The case has even pointed to a suspect, charged with child molester Julio Antonio Ramos, who is currently in prison. Patz's babysitter had been dating the man, and Ramos did know the kid, but has denied taking him away. New evidence in the case suggests another suspect who lived in the apartment at the time: a... We can learn from the passage that _ . A) People air the same view about the case on the Internet B) People reject the reopening of the case of the missing boy C) The missing-person case still has a long-lasting influence on people D) Twitter is the only place for people to discuss about missing-person cases

Ans:
C