Do you know why different animals or pests have their special colours? Colours in them seem to be used mainly to protect themselves. Some birds love eating locusts (蝗虫), but birds cannot easily catch them, why? It is because locusts change their colours with the change of the colours of crops. When crops are green, locusts look green. But as the harvest (收获) time comes, locusts change to the same brown colour as crops have. Some other pests with different colours from plants are easily found and eaten by others. So they have to hide themselves for living and appear only at night.

    If you study animals' life, you'll find the main use of colour is to protect themselves. Bears, lions and other animals move quietly through the forests and they cannot be easily seen by hunters. This is because they have the colours much like the trees.

    Have you ever noticed an even stranger act? A kind of fish in the sea can send out a kind of very black liquid (液体) when it faces danger. While the liquid spreads, its enemies cannot find it. And it immediately swims away. So it has lived up to now though it is not strong at all.

    There are many online food shopping sites. Things l{#blank#}1{#/blank#}CDs, books, and DVDs sell well online. But it is quite different to sell food online because people like to see food with their o{#blank#}2{#/blank#} eyes. It is very I {#blank#}3{#/blank#} for people to buy fresh fruit and vegetables. Customers like to c{#blank#}4{#/blank#} their food by its color. They also want to touch and smell it. Some people like going to the same shop to buy food with good quality. So if the food is always g{#blank#}5{#/blank#}, they will feel comfortable buying it online.

    Boxes of fruits and vegetables have been d{#blank#}6{#/blank#} to homes around Britain for a few years now. Dried or canned foods are almost the same all the time, but fresh things are not. For example, People may want to pick their own apples so they can take the o{#blank#}7{#/blank#} that look nice. Buying dried and canned food online is easier. A person can buy this kind of food on the Internet and then buy fruits and vegetables at a store or a market.

Different weather makes people feel different. It influences health, intelligence and feelings.

In August, it is very hot and wet in the northern part of the United States. People there have heart trouble and other kinds of health problems during this month. In the Northeast and the Middle West, it is very hot at some times and very cold at other times. People in these states have more heart trouble after the weather changes in February or March.

The weather can also influence intelligence. For example, in a scientific report, IQ of a group of students was very high when a very strong wind came, but after the wind, their IQ was 10% below. The wind can help people have more intelligence. Very hot weather, on the other hand, can make it lower. Students in many schools of the United States often get worse on exams in the hot months of the year（July and August）.

Weather also has a strong influence on people's feelings. Winter may be a bad time for thin people. They usually feel cold during these months. They might feel unhappy during cold weather. But fat people may have a hard time in hot summer.

Low air pressure may make people forgetful. Research shows that people leave more bags on buses and in shops on low-pressure days. However, at about 18℃, people become healthier and stronger. People feel best at this temperature.

Are you feeling tired, forgetful or unhappy today? It may be the weather's problem.

    How to build good relationships with people from other cultures? Actually, it is important to learn some communication skill. {#blank#}1{#/blank#}.

    Learn about the culture in advance. A little knowledge can go a long way. So if you have time before going abroad or meeting with someone from another culture, try to take time to learn the basic "do's and don'ts" of that culture. {#blank#}2{#/blank#} It's very convenient.

    Be respectful and tolerant. {#blank#}3{#/blank#} Signs of these may appear when you communicate with people from other cultures. However, it is not the time to judge people based on these differences during basic communication. Instead, respect them for what they are, and tolerate them.

    Speak clearly and slowly. But do not shout at others even if they don't understand you. {#blank#}4{#/blank#} Instead, it can be seen as a rude behavior. What's more, even if there are difficulties in communicating with people from other cultures, do not treat other people as though they are stupid.

    {#blank#}5{#/blank#} In some cultures, looking another person in the eye when you speak is seen as a sign of honesty and interest. However, in other cultures, it may be disrespectful.

    Imagine you are taking a walk on the beautiful beach. Just then, your feet step over something and you hear a crack (噼啪声) —an empty plastic bottle. Things like this are happening more often because of sea rubbish.

    Studies show that 80%of all the waste is from the land. The waste is mainly plastics (塑料制品) which are really hard to degrade (降解). So the rubbish will remain there for a long time. Some of the pollution is caused accidentally. For example, about 10,000 product-filled boxes are lost at sea every year from business ships. Sometimes people just throw things into the water from boats or land. Many large rubbish areas are formed in the North Pacific Ocean.

    Thankfully, the situation isn't ignored (忽视). Groups like the National Oceanic and Atmospheric Association (NOAA) are taking action to help clean the sea. Since 2006, 76 projects have cleared out 3,814 metric tons (公吨) of rubbish from the sea. Methods of rubbish cleaning include using machines to remove (移除) the waste away from the surface of sea water. Besides, special nets are set by the mouths of rivers to stop the rubbish before it reaches the sea. If everyone does his part, sea rubbish seems like a problem that can be solved.