Read the following article and select the best answer. Article: The oldest and most common source of renewaBle energy known to man, Biomass is one of the most important forms energy production in the United States and elsewhere. Since such a wide variety of Biomass materials is everywhere ---- from trees and grasses to agricultural and city ---- life wastes ----Biomass promises to play a continuing role in providing power and heat for millions of people around the world. According to the Union of Concerned Scientists(UCS), Biomass is a kind of renewaBle energy source that produces no carBon dioxide , Because the energy it contains comes from the sun. When plant matter is Burned, it gives off the sun's energy. In this way, Biomass serves as a sort of natural Battery for storing the sun's energy. As long as Biomass is produced continuously ----with only as much grown as is used--- the "Battery" lasts forever. According to the Energy Information Administration, Biomass has Been one of the leading renewaBle energy sources in the United States for several years running through 2007, making up Between 0.5 and 0.9 percent of the nation's total electricity supply. In 2008----although the numBers aren't all in yet----wind power proBaBly took over first place Because of the rapid development of wind farms across the country. Producing power from Biomass helps reduce some 11 million tons of carBon dioxide each year. Some homeowners also try to make their own heat By using Biomass materials. Such practice may save homeowner's money, But it also produces a lot of pollution. So, the Best way is to encourage power plants to use it. Question: Why is Biomass considered as " a sort of natural Battery"? - It Burns merely plant matter. - It keeps producing electricity. - It stores the energy from the sun. - It produces zero carBon dioxide.
It stores the energy from the sun.

Read the following article and select the best answer. Article: It is love that makes the world go round. And it is also love that has such power to overcome all difficulties. So we say: "Love will find a way." As smile is a facial expression showing pleasure, affection, and friendliness, it is the commonest way to show our good will perfectly without saying anything. A Chinese saying runs: "never hit a person who is smiling at you." It is a time-proven fact that the smile is a language all its own-- a universal language--understood by the people of every nation in the world. We may not speak the same tongue as our foreign neighbors, but we smile in the same tongue. We need no interpreter for thus expressing love, happiness, or good will. One day while shopping in a small town in southern California, it was my misfortune to be approached by a clerk whose personality contradicted mine. He seemed most unfriendly and not at all concerned about my intended purchase. I bought nothing, and marched angrily out of the store. My anger toward that grew with each step. Outside, standing at the corner, was a dark-complexion young man in his early twenties. His expressive brown eyes met and held mine, and in the next instant a beautiful, dazzling smile covered his face. I gave in immediately. The magnetic power of that shining smile drove away all bitterness within me, and I found the muscles in my own face happily responding. "Beautiful day, isn't it?" I remarked, in passing. Then, suddenly something inside me sent me turning back. "I really owe you a debt of gratitude," I said softly. His smile deepened, but he made no attempt to answer. A Mexican woman and two men were standing nearby. The woman stepped forward and eyed me inquiringly. "Carlos, he no speak English," she volunteered. "You want I should tell him something?" In that moment I felt transformed. Carlos' smile had made a big person of me. My friendliness and good will toward all mankind stood ten feet tall. "Yes," my reply was enthusiastic and sincere, "tell him I said 'Thank you!'" "Thank you?" The woman seemed slightly... Question: From the conversation between the author and the Mexican woman, we can infer that the woman _ . - was well-educated but unwilling to help others - was able to speak English - knew some English and was ready to help others - was familiar with the young man
knew some English and was ready to help others

Q: Read the following article and select the best answer. Article: As students enter the school building, they are easy targets of peer pressure.Students may become involved in activities that are dangerous to themselves, or others, due to peer pressure. Drugs, including alcohol, are a major part of peer pressure.A research institute reports that about 30 percent of the teenagers are offered drugs in middle and high schools.The majority of teens consume their first drink of alcohol at the age of 13.The National Household Survey on Drug Use and Health from the Department of Health and Human Services informs the public that 74.3 percent of the high school students have tried alcohol.A large percentage of those who drink alcohol are also smokers.The American Lung Association points out that about 3.1 million adolescents are smokers in the U.S.Almost 25 percent of teens between 17 and 18 are regular smokers. Peer pressure can affect the behavior, clothing choice, music and movie choice and even the personality.Academics can also be affected by peer influence.People can be affected by these factors and remain completely unaware of the changes in their lifestyle, but some people do realize when they are being pressured.Just by simply spending time with others, a person can become more like them. "If you are being pressured to do things that you know are wrong," Shears, a senior, said, "you should get out of that situation anti tell a trusted adult." For people to avoid becoming a victim of peer pressure, they must make their own decisions.Judgment of a situation based on one's morals is very important in peer pressure situations."People," Sheats added, "should follow their own hearts." Question: The passage is mainly about _ . - peer influence - teenagers' lifestyles - academic pressure - moral judgment
A: peer influence