(Q = Question; A = Answer)

    Situation I

    Q: If someone sits right next to me in an empty movie theater, is it rude to move?

    A: Maybe, but nobody will fault you for it. Chances are that close sitter doesn't realize he disturbs you, so he may miss your annoyance. You undoubtedly aren't the first person he's met who needs enough room. Forgive his bad judgment, move quietly and enjoy the show.

    Situation II

    Q: If I use the bathroom at a store, do I need to buy something?

    A: Consider frequency and urgency. Is this a one-time or an emergency? If so, you don't have to buy anything, but it would be kind if you did. However, if you regularly use the bathroom at this place, then you are a customer, and you should act like one.

    Situation III

    Q: If someone is talking loudly on the bus, is there a nice way to ask him to keep it down?

    A: No. Try other means.1) Stare at him until he gets aware of it and quiets down. 2) Lift your finger in a silence motion(动作)and smile. 3) Put on earphones and ignore him.

    Situation IV

    Q: If I remember my friend's birthday a day late, should I apologize or just wish her a happy birthday like nothing happened?

    A: This is the reason why the word belated was invented. "Happy belated birthday!" is short for: "Well, I know I forgot, but then I remembered. Forgive me and happy birthday."

    Situation V

    Q: Can I lie about seeing a text because I was too busy or lazy to respond(回复) to it?

    A: Don't lie. Receiving a text does not mean you need to respond to it. Why waste a perfectly good lie when the truth will serve? "Yes," you can say if ever asked, "I saw it." No explanation is needed as to why you don't respond.

    I've seen a couple of the other Fast Furious films but this one is definitely best. Dominic Toretto (played by Vin Diesel), Brian O' Conner (Paul Walker) and Mia Toretto (Jordana Brewster) are planning to steal $100 million from businessman Hernan Reyes (Joaquim de Almeida). At the same time, agent (联邦特工) Luke Hobbs (Dwayne Johnson) is chasing after them. The story's pretty fast-moving and the car chase at the end is amazing.

—Derek

    Well, if I'd known it was an action film, I wouldn't have gone to see it. I mean, I can't stand action films. And I'll tell you another thing – I can't stand Vin Diesel. I mean he can't act to save his life. The film would have been much better with someone like Mau Damon or George Clooney. The only good thing about it was the soundtrack (电影配乐) which was pretty good. And I won't be going to see any other Fast & Furious movies either!

—Zoe

    Well it started off all right, but the romance between Mia and Brian was a bit inadequate (不足的) and the whole thing lost its way. It was as if the director couldn't decide whether he was making a thriller, an action movie or a romantic comedy (喜剧), so he ended up making none of them.

—Mario

    It was amazing! I can't believe it was really over two hours long. It just flashed by. The direction was superb； Justin did a really good job. And the acting was great. I know Vin Diesel isn't going to win an Oscar or anything like that but he's good at what he does. And the plot! I laughed out loud quite a few times. The funny thing is, I wouldn^'t have bothered seeing it if my friend hadn't suggested going.

—Megan

    The US teenager Thomas Cheatham had planned to study Latin during his time at Hebron High School in Texas. But when he learned that the school district was going to offer a Mandarin class, he quickly changed his mind.

    “I thought Mandarin would be more beneficial than Latin,” said Cheatham, who is now in his second year of studying the language. He speaks Mandarin to order food at Chinese restaurants and can read social media posts from his Chinese-speaking friends.

    While it's a difficult language to master, the high school junior, who plans to study computer engineering, thinks it will be important for his career. “Chinese is a good language to know, especially with China becoming a growing power,” he said.

    Many experts agree that proficiency in a language spoken by a billion people worldwide will give American students an edge in the global economy. “People are looking at China as our next economic competitor, and interest in Mandarin is growing,” said Marty Abbott, executive director of the American Council on the Teaching of Foreign Languages. “We're seeing it in all parts of the country. ”

    Abbott estimates that as many as 100, 000 students are now studying Mandarin throughout the US, in public and private schools. She said the US government has designated (指定) Mandarin as a “critical needs” language and provides professional development programs for teachers. “Our government wants to increase our language competency for national security and economic competitiveness,” Abbott said.

    At the same time, the Chinese government is spreading knowledge of the Chinese language and culture through Confucius Institutes established in many US states. For example, the Confucius Institute at the University of Texas in Dallas has been the home of a Confucius Institute for 10 years. It sponsors Confucius Classrooms at 21 local public and private schools, where tens of thousands of students are learning Mandarin.

    You probably know that frogs hop (双足跳). But did you know that there's a small frog in the Pacific Northwest that belly flops (肚子先着水)? It's called a tailed frog.

    Dr. Rick Eisner, who has been studying tailed frogs for the past few years, says, "I've looked at thousands of jumps and have never seen them land on their feet like other frogs." Most of the time, tailed frogs land on their stomachs and then bring their back legs in to prepare for another jump.

    Eisner first noticed these frogs because of the way they swim. Other frogs kick both of their back legs at the same time. But when a tailed frog swims, it pushes first with one leg and then the other.

    To try to find out why tailed frogs bellyflop, Eisner and other scientists collected and filmed different kinds of frogs. They found that all of the frogs start their jumps the same way: They hold out their legs. The change comes in the landing. Tailed frogs can't move their back legs as quickly as other frogs do. Maybe they don't need to. Tailed frogs live around water and quickly jump into the water to escape danger.

    Early frogs developed around watery areas and could jump quickly into the water to escape danger. Scientists think those frogs blended in with (与…融合在一起) the green plants on the side of the rocky rivers, just like today's tailed frogs. "I would guess that other animals would have problems detecting them," explains Eisner. When other animals find those early frogs, the frogs could jump into the river. They didn't need to continue hopping.

    Tailed frogs and other kinds of frogs went their own ways about 200 million years ago. Tailed frogs stayed by rivers. Other kinds of frogs moved to places where new hopping skills allowed them to survive.

    Birdbrain has long been a term when laughing at somebody. The common opinion is that birds' brains are simple. But that opinion has increasingly been called into question because crows and parrots, among other birds, have shown behaviors as smart as that of chimpanzees.

    The conflict of simple brain and complex behavior has led some neuroscientists (神经学家) to create a new map of the birdbrain.

    Today, in the journal Nature Neuroscience Reviews, an international group of bird experts is showing their opinion. Nearly everything written in anatomy (解剖学) textbooks about the brains of birds is wrong, they say. The bird brain is as complex, and creative as any mammal brain, they argue, and it's time to use a more exact term that shows a new understanding of the anatomies of bird and mammal brains.

    "Names have a powerful influence on the experiments we do and the way we think," said Dr. Erich, a neuroscientist at Duke University and a leader of the Bird Brain Terms Association. "Old term has prevented scientific progress."

    The association of 29 scientists from six countries met for seven years to develop new, more exact names for structures in both bird and mammal brains. For example, the bird's seat of intelligence or its higher brain is now named the pallium (大脑皮层).

    "The change of terms is a great advance," said Dr. Jon Kaas, a leading expert in neuroanatomy at Vanderbih University. "It's hard to get scientists to agree about anything."

    Scientists have come to agree that birds are indeed smart, but those who study bird intelligence differ on how birds got that way. Experts are split into two warring camps. One holds that birds' brains make the same kinds of internal (内在的) connections as do mammal brains and that intelligence in both groups arises from these connections. The other holds that bird intelligence developed through increasing an old part of the mammal brain and using it in new ways and it questions how developed that intelligence is.

    Steven Stein likes to follow garbage trucks. His strange habit makes sense when you consider that he's an environmental scientist who studies how to reduce litter, including things that fall off garbage trucks as they drive down the road. What is even more interesting is that one of Stein's jobs is defending an industry behind the plastic shopping bags.

    Americans use more than 100 billion thin film plastic bags every year. So many end up in tree branches or along highways that a growing number of cities do not allow them at checkouts(收银台). The bags are prohibited in some 90 cities in California, including Los Angeles. Eyeing these headwinds, plastic-bag makers are hiring scientists like Stein to make the case that their products are not as bad for the planet as most people assume.

    Among the bag makers' argument: many cities with bans still allow shoppers to purchase paper bags, which are easily recycled but require more energy to produce and transport. And while plastic bags may be ugly to look at, they represent a small percentage of all garbage on the ground today

    The industry has also taken aim at the product that has appeared as its replacement: reusable shopping bags. The stronger a reusable bag is, the longer its life and the more plastic-bag use it cancels out. However, longer-lasting reusable bags often require more energy to make. One study found that a cotton bag must be used at least 131 times to be better for the planet than plastic.

    Environmentalists don't dispute(质疑) these points. They hope paper bags will be banned someday too and want shoppers to use the same reusable bags for years.