If we are observant(善于观察的), we can find that most of the flowers in nature are red, orange and yellow. If we have seen a black flower, it is a chance in a million. People have made census (统计) to colors of more than four thousand kinds of flowers and discovered that only eight of them are black. Why are black flowers so rare?

    As we know, sunlight is formed by seven different kinds of colored light. The wave length of each light changes, so the quantity of heat in each light changes, too. Flowers, especially their petals (花瓣) , are very weak and easy to the harm caused by high temperature. Black flowers can take in all the light waves, which cause the flowers to dry up in a high temperature. So the black flowers can hardly continue their lives. While red flowers, orange flowers and yellow ones can protect themselves from sunlight by reflecting（反射） the red light, orange light and yellow light, each of which has a large quantity of heat.

    That is why red, orange and yellow flowers are very common in nature while black flowers are so unusual.

    Killer whales in Alaska's Bering Sea have figured out an easy way to get fed. Instead of seeking out the fish them- selves, the clever whales chase down fishing boats and steal the entire catch of the day, as much as 20,000 to 30,000 pounds.

    Killer whale “thieves” are not a new phenomenon. Japanese fishermen have reported being followed by killer Whales since the 1950s. However, the increasing frequency of whale fish theft in the Bering Sea's continental shelf is now threatening the livelihood of fishermen.

    Paul Clampitt, a local fisherman, says his crew tried to keep the whales away with loud sounds. Though that worked for a short time, the whales now consider the noise “ a dinner bell”. Jay Herbert tried using sonar to keep the whales away. He also met with little success. According to the experienced fisherman, the smart whales deliberately seek out longliners (延绳钓渔船）, and, all the first opportunity presented to them, steal the fish, leaving behind just the lips of the fish caught!

    NOAA Fisheries biologist John Moran is not surprised at the whales' thieving skill. The expert says whales are skilled hunters who can distinguish the sounds of different boats and even recognize the sounds of the operating system that places the fishing equipment into the ocean. The expert jokes, “ Grabbing a fish off a line is nothing.” Since they are social animals, it is easy for whales to pass their skills on to others.

    Killer whales are not the only whale species that have learned to steal from humans. In the Gulf of Alaska, sperm whales also conduct similar thefts. Longline fishermen off Washington, Chile, Australia, Hawaii, and many other countries have reported similar incidents. There is, unfortunately, no easy fix to this problem. One of the possible solutions is using pot traps similar to the ones used to catch crabs. However, the cost of switching from longline to pot fishing is too high, especially for small-scale fisheries. There is also no guarantee that the catch will be safe from the intelligent whales which, many fear, will eventually figure out how to open the pots!

    I'm Mr. Lockwood and have been to see my landlord Mr. Heathcliff today. He was standing at the gate to his farm when I arrived. His black eyes looked at me suspiciously.

    The name of Mr. Heathcliff's house is Wuthering Heights. 'Wuthering' means 'stormy' or 'windy' in the local language and it describes the place well. The house stands on the top of a hill. On one side of it there are a few trees. They all lean in the same direction, blown by the strong north winds.

    Then we went into the sitting room. The floor was made of smooth, white stone. There was a big fireplace at one end of it and a large dresser at the other end. Several large hunting dogs were lying in the dark corners of the room. I sat down in one of the chairs near the fire. But unfortunately, when Mr. Heathcliff was out for his servant, Joseph, I was attacked by his hunting dogs.

    To my surprise, I enjoyed our conversation very much, though. When it was time for me to leave, I said, 'I'll come and see you again tomorrow'. I set out after lunch the following day. But Mr. Heathcliff wasn't in, and a young man led me to the sitting room. His manner was proud and free, so I couldn't decide if he was a servant or not. He was dressed like one and spoke like one.

    A few minutes later, Heathcliff walked in. We all drank our tea in silence and there was a very tense atmosphere in the room. I thought it was my fault so I tried to be sociable.

    This is a beautiful part of the country,' I said, 'but very isolated. However, you seem very happy here, with your wife and family…'

    'My wife!' Heathcliff exclaimed looking around him. 'Where? Are you talking about her spirit?'

    How stupid of me! Of course the girl wasn't his wife! She was much too young for him. She must be married to the young man.

    'Mrs. Heathcliff is my daughter-in-law', said Heathcliff, reading my thoughts. There was hatred on his face as he spoke.

    Ah, yes,' I said. 'You are very lucky to have such a lovely wife, young man.'

    The youth went red and looked down at his plate.

    I said she was my daughter-in-law, sir. She was married to my son,' said Heathcliff.

    And this young man is…'

    Not my son.'

    My name is Hareton Earnshaw,' growled the youth angrily.

    The atmosphere began to depress me. After a long silence I asked, 'Perhaps one of your servants is free now to take me home?'

    There's only Heathcliff, Hareton, Zillah the housekeeper, Joseph and me here', said the girl.

    Then I suppose I'll have to stay until the morning.' I replied

    That night, I was arranged in a house where the master didn't usually allow people to stay. I closed the door and got into bed. I put my candle on a small shelf next to a pile of old books. To my surprise, I saw that the shelf was covered in writing. These names were scratched in the paint: Catherine Earnshaw, Catherine Heathcliff and Catherine Linton.

    I picked up one of the books on the shelf. It was a diary. On the first page I read, 'Catherine Earnshaw, her book', and a date of twenty-five years ago. Curious to know more about this Catherine, I started to read. I understand the following: Catherine Earnshaw's father was dead and she lived with her cruel older brother Hindley. Catherine and Heathcliff were close friends, but Hindley and his young wife Frances heated and abused the adopted Heathcliff.

    I had terrible dreams that night. There was a lot of noise-rapping and tapping sounds. I woke up. The branch of a tree outside was hitting the glass in the window. I got up, pushed my hand through the glass and pout out my arm. But instead of the branch my fingers closed on a little ice-cold hand. The hand held mine tightly and a sad voice sobbed, 'Let me in!'

    Who are you?' I said.

Catherine Linton' it replied. 'I've come home. I lost my way on the moor! Let me in!"

    Canada is a very large country. It is the second largest country in the world. By contrast(比较)it has a very small population. There are only about 29 million people (by the year 1996) there. Most Canadians are of British or French origin, and French is an official language of Canada as well as English. About 45% of the people are of British origin, that is, they or their parents or grandparent, etc., come from Britain. Nearly 30% are of French origin. Most of the French-Canadians live in the province of Quebec.

    Over the years, people have come to live in Canada from many countries in the world. They are from most European countries and also from China, besides other Asian countries.

    However, Canada was not an empty country when the Europeans began to arrive. Canadian Indians lived along the coast, by the rivers and lakes and in forests. Today there are only about 350,000 Indians in the whole country, with their own languages. In the far north live the Inuit. There are only 27,000 Canadian-Inuit. Their life is hard in such a harsh climate.

    There are two types of people in the world. Although they have equal degree of health and wealth and other comforts of life, one becomes happy, the other becomes unhappy. This arises from the different ways in which they consider things, persons, events and the resulting effects upon their minds.

    People who are to be happy fix their attention on the convenience of things. The pleasant parts of conversation, the well prepared dishes, the goodness of the wine, the fine weather. They enjoy all the cheerful things. Those who are to be unhappy think and speak only of the opposite things. Therefore, they are continually dissatisfied. By their remarks, they sour the pleasure of society, offend (hurt) many people, and make themselves disagreeable everywhere. If this turn of mind was founded in nature, such unhappy persons would be the more to be pitied. The intention of criticizing and being disliked is perhaps taken up by imitation. It grows into a habit, unknown to its possessors. The habit may be strong, but it may be cured when those who have it realize its bad effects on their interests and tastes. I hope this little warning may be of service to them, and help them change this habit.

    Although in fact it is chiefly an act of the imagination, it has serious results in life since it brings on deep sorrow and bad luck. Those people offend many others; nobody loves them, and no one treats them with more than the most common politeness and respect. This frequently puts them in bad temper and draws them into arguments. If they aim at getting some advantages in social position or fortune, nobody wishes them success. Nor will anyone start a step or speak a word to favor their hopes. If they bring on themselves public objections, no one will defend or excuse them, and many will join to criticize their wrongdoings. They should change this bad habit and be pleased with what is pleasing, without worrying needlessly about themselves and others. If they do not, it will be good for others to avoid any contact with them. Otherwise, it can be disagreeable and sometimes very inconvenient, especially when one becomes mixed up in their quarrels.