Hundreds of years ago，a Roman army came north from England to make war on Scotland. The Scots，a brave people，loved their country very much. They fought hard to drive the enemy out of Scotland，but there were too many Romans. It looked as if the Romans would win.

    One night，the leader of Scots marched his soldiers to the top of a hill. "We will rest here tonight，my men,” he said. "Tomorrow we will fight one more battle. We must win or we will die."

    They were all very tired，so they ate their supper quickly and fell asleep. There were four guards on duty, but they were very tired as well and also fell asleep one by one.

    The Romans were not asleep. Quickly they gathered at the foot of the hill. Slowly they climbed up the hillside, taking care not to make a sound. Closer and closer they came to the sleeping Scots. They were almost at the top. A few minutes more，the war would be over. Suddenly，one of them put his foot on a thistle(蓟). He cried out and his sudden cry woke the Scots. In a moment，they were on their feet and ready for battle. The fighting was hard but it did not last long. The Scots wiped out the Romans and saved their country.

    The thistle is not a beautiful plant. It has sharp needles all over it. Few people like it. But the people of Scotland liked it so much that they made it their national flower.

根据短文内容，选择最佳答案，并将选定答案的字母标号填在题前括号内。

    Which comes first, happiness or money? Are richer people happier? And if so, how do people get much richer? A recent study could tell you the answer.

    The study looked into thousands of teenagers and found that those who felt better about life as young adults tended to have higher incomes by the time they turned 29.Those who were happiest earned an average of $8,000 more than those who were the most depressed.

    The researchers, from University College London and the University of Warwick, say that very gloomy teens, no matter how tall or smart they were, earned 10% less than their peers, while the happier ones earned up to 30% more.

    Happier teenagers have an easier time getting through school, college and a job interview, chiefly because they always feel better about life. It may also be true that happier people find it easier to make friends, who are often the key to homework help or networking.

    A report in June suggested that professional respect was more important than dollars in terms of workplace happiness. In August scientists announced that they had found the gene for happiness in women, Alas (the same gene doesn't appear to have the same effect on men).And in October researchers in the UK and in the US announced that people who eat seven portions of fruit and vegetables a day report being the happiest.

    The big question is: if it really is true that happier kids end up being wealthier kids , is it necessary for parents to get their kids to do the homework? The fact is that no homework will make kids happy but surely hurt their grades. Studies do show, after all, that more education leads to better-paid jobs, which may give us a deep thought.

    "These findings show that the teenagers' happiness is important to their future success," one of the report's authors writes. "But what is the most important is that we should find a way to help children gain more satisfaction from doing schoolwork."

    With five breakout(破纪录的) games, Jeremy Lin has become the NBA's newest star.

    In the New York Knicks' 92-85 won over the Los Angles Lakers last Saturday, Lin had a career-high 38 points. A day later, he led the Knicks to their fifth victory, 100-98 to Minnesota Timberwolves. In his previous games, Lin, 23, had 23 points against the Washington, 25 points against New Jersey and 28 against Utah in his first start.

    Lin is smart. Before graduating from high school in California, he had sent his application to all the Ivy League Schools(常青藤联盟). He only got into Harvard and Brown, and he chose Harvard. In 2010, Lin graduated with a degree in economics.

    Lin is the first Chinese-American player in the NBA. He was born in the US and his family is Asian. Although not born in China, Lin has attracted nearly all Yao Ming's old fans, who see him as a powerful role model.

    He started off on the Golden State Warriors. Lin first signed with the Warriors in July, 2010, but seldom played in games before the start of the fourth quarter. His first time on the court for the Warriors earned him seven points, three rebounds(篮板球) and two assists in just 11 minutes.

    He is really perfect for the Knicks. The New York Knicks has been in need of a reliable point guard and to Mike D'Antoni, the Knicks coach who's going through a difficult season, Lin is a most unexpected figure. Lin just does everything easy and the rest of the guys around him are playing the way we want to," D'Antoni said. "I think it's for real, and it can only get better."

    Dodder is an unusual and unwanted plant that attacks other plants. Except for its flowers, the plant looks like spaghetti, a kind of noodles in the shape of long thin pieces that look like string when they are cooked. It's almost leafless, thread-like stems hang down on top of other plants that dodder needs to stay alive. Dodder does not produce its own food. Instead, it steals food from other plants. It feeds by sucking juices from the plant which is wrapped around, often making its host very weak or even killing it.

    Dodder can find other plants by their smell. When a young dodder plant starts growing, it follows the smell of plants it prefers, like tomato plants, potato plants, or other farm crops. Unlike most plants that usually grow in the direction of light or warmth, a dodder plant will grow in the direction of, for example, tomato smell—if a tomato happens to be growing nearby.

    However, a young dodder plant must find a host plant quickly. It no longer needs its root once it is attached to the host and wrapped around it. If it cannot catch a smell of a potential host within a few days, it will dry up and vanish even if there is plenty of water around. Once it finds a host, the young dodder plant will attach itself to it and start growing faster. At that point the dodder plant will drop its root.

    Dodder is thus a difficult weed to manage and a real headache for farmers. When it does get out of hand, dodder can greatly reduce a farmer's harvest or even destroy crops completely. Before sowing their produce, especially farmers in warm parts of the world often check to make sure no unwanted dodder seeds have mixed with their crop seeds. This is a good way to stop dodder plants from making their way to a crop field secretly.

    Most people will answer a ringing phone. Usually you don't know who is phoning or how urgent their business is, so a ringing phone is difficult to ignore. In one experiment, a researcher wrote down the numbers of several public phones in stations and airports. Then he called the numbers. Someone nearly always answered. When he asked why, people usually said, "Because it rang."

    A few years ago in New Jersey, a man with a rifle killed 13 people. Armed police surrounded his house but he refused to come out. A reporter found out the phone number of the house and called.

    The man put down his rifle(步枪) and answered the phone. "What do you want?" he said, "I'm really busy right now."

    Imagine you're at work and the phone is ringing in someone else's office. Do you answer it or not?

    In one survey on telephone use, 51% of participants told researches that they did. We can't ignore the phone and for the reason, it forces its way into our lives. It interrupts what we are doing and on top of that, the caller is often someone we don't really want to talk to. However, in the survey, 58% said they never took the phone off the hook, and 67% didn't mind if someone called during a television programme. For 44% it wasn't a problem if someone rang during a meal, while only 28% were annoyed or upset.

    If someone phoned in the middle of the night, 40% told researchers that they got nervous or frightened, while around 30% got angry.

    Of course, when someone is really annoying, you can choose to hang up on him/her. This is in fact one of the rudest things you can do on the phone, but 79% said they were prepared to do it in some cases. Only 6% told researchers they never hung up on people.

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.