Americans gave nearly $300 billion away last year. Do you know the reason? Beyond the noble goals of helping others, it is that giving will make them happier. It is a fact that givers are happier people than non-givers. According to the Social Capital Community Benchmark Survey, a survey of 30,000 American households, people who give money to charity are 43% more likely than non-givers to say they are "very happy" about their lives. Similarly, volunteers are 42% more likely to be very happy then non-volunteers. The happiness difference between givers and non-givers is not due to differences in their personal characteristics, such as income or religion. Imagine two people who are identical in terms of income and faith, as well as age, education, politics, sex, and family circumstances, but one donates money and volunteers, while the other does not. The giver will be, on average, over 40 percentage points more likely to be very happy than the non-givers. A number of studies have researched exactly why charity leads to happiness. The surprising conclusion is that giving affects our brain chemistry. For example, people who give often report feelings of euphoria, which psychologists have referred to as the "Helper's High". They believe that charitable activity produces a very mild version of the sensations people get from drugs like morphine and heroin. Of course, not only does giving increase our happiness, but also our happiness increases the possibility that we will give. Everyone prefers to give more when they are happy. Researchers have investigated this by conducting experiments in which people are asked about their happiness before and after they participate in a charitable activity, such as volunteering to help children or serving meals to the poor. The result is clear that giving has a strong, positive causal impact on our happiness, so does happiness on giving Which of the following is the main theme of this passage? A) Giving brings happiness. B) Americans love donating. C) The happiness difference. D) Feelings of volunteers.
A
Every English learner hopes to find a patient native speaker who will politely correct mistakes and teach him some useful new vocabulary. But native speakers can be hard to find. If you're having trouble communicating in English, American situation comedies are one good way to help. They can not only give you a lot of information about American culture, but also offer some useful daily expressions. Watching them will help you enlarge your vocabulary and teach you correct language usage in different situations. Best of all, situation comedies are a fun way to learn. The Apprentice The American reality TV show is hosted by the famous businessman Donald Trump. It's based on the idea of the final job interview for the final job. The show picks 16 people to compete for a job with Trump's business. Those who fail their weekly tasks have to meet with Trump. They have to explain why they should not be fired . The Apprentice is useful for English students who want to learn how to make up a persuasive argument. For example, rather than say "I think I did a good job", one may also learn to throw off the possibility of uncertainty by saying, "I did a good job." Desperate Housewives (DH) Desperate Housewives is set in an invented American town, Wisteria Lane. It follows a group of middle-aged women as they go through their daily family lives. But in fact, those women live a life of lies, secrets, criminal acts, and mystery. This program is good at expressing the funny life of American neighbors. And, it's the perfect comedy series for foreign learners wanting to see how to hold a relaxed daily conversation. Another reason for watching DH is to learn some expressions American families use that are not in your English language textbooks. For example, the mothers often use words such as "sport" and "you guys" to speak about their kids. According to the passage, The Apprentice and DH are introduced because _ . A) they are now the most popular programs B) they are helpful in English learning C) they are advertised for English beginners D) they are enjoyed by most young people
B
Q: The world's oceans are slowly getting more acidic, say scientists. The researchers from California say the change is taking place in response to higher levels of carbon dioxide in the atmosphere. The lowering of the waters' pH value is not great at the moment but could pose a serious threat to current marine life if it continues, they warn. Ken Caldeira and Michael Wickett, from the Lawrence Livermore National Laboratory, report their concerns in the journal Nature. Increasing use of fossil fuels means more carbon dioxide is going into the air, and most of it will eventually be absorbed by seawater. Once in the water, it reacts to form carbonic acid. Scientists believe that the oceans have already become slightly more acidic over the last century. But these researchers have tried to predict what will happen in the future by combining what we know about the history of the oceans with computer models of climate change. "This level of acidity will get much more extreme in the future if we continue releasing CO2 into the atmosphere," said Dr Caldeira. "And we predict amounts of future acidity will exceed anything we have seen over the last several hundred million years, let alone perhaps after rare catastrophic events such as asteroid impacts ." If carbon dioxide release continues unabated , ocean pH could be reduced by as much as 0.77 units, the authors warn. It is not ly clear what that means for marine life, however. Most organisms live near the surface, where the greatest pH change would be expected to occur, but deep-ocean lifeforms may be more sensitive to pH changes. Coral reefs and other organisms whose skeletons or shells contain calcium carbonate may be particularly affected, the team speculate. They could find it much more difficult to build these structures in water with a lower pH. In recent years some people have suggested deliberately storing carbon dioxide from power stations in the deep ocean as a way of curbing global warming. But Dr Caldeira said that such a strategy should now be... According to Dr Caldeira, _ . A) the future situation of the amount of acidity is extremely serious B) ocean absorption of carbon dioxide is a good thing C) scientists may predict climate changes with computer models D) more oil fuels will be used in the near future
A: A