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Words are to a language______bricks are to a building.
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The news can be classified to______.
What would a six-month-old baby love to do？
Specialists in marketing have studied how to make people buy more food in a supermarket. They do all kinds of things that you do not even notice. For example, the simple, ordinary food that everybody must buy, like bread, milk, flour, and vegetable oil, is spread all over the store. You have to walk by all the more interesting-and more expensive-things in order to find what you need. The more expensive food is in packages with bright colored pictures. This food is placed at eye level so you see it and want to buy it. The things that you have to buy anyway are usually located on a higher or lower shelf. However, candy and other things that children like are on lower shelves. One study showed that when a supermarket moved four products from floor to eye level, it sold 78 percent more.
Another study showed that for every minute a person is in a supermarket after the first half hour, she or he spends $50. If someone stays forty minutes, the supermarket has an additional $5.00. So the store has a comfortable temperature in summer and winter, and it plays soft music. It is a pleasant place for people to stay and spend more money.
Some stores have red or pink lights over the meat so the meat looks redder. They put light green paper around lettuce (生菜) and put apples in red plastic bags.
So be careful in the supermarket. You may go home with a bag of food you were not planning to buy. The supermarket, not you, decided you should buy it.
Marketing specialists study______.
Trees have a spectacular (壮丽的；奇观的) survival record. Over a period of more than 400 million years, they have evolved as the tallest, most massive, and longest-lived organisms ever to inhabit the Earth. Yet trees lack a means of defense that almost every animal has: trees cannot move away from destructive forces. Because they cannot move, all types of living and nonliving enemies—fire, storms, microorganisms, insects, other animals and, later, humans—have wounded them throughout their history. Trees have survived because their evolution has made them into highly compartmented (分隔的) organisms: that is, they wall off injured and infected wood.
In that respect trees are radically different from animals. Fundamentally, animals heal, they preserve their life by making billions of repair, installing (安置) new cells or rejuvenated (恢复活力的) cells in the positions of old ones. Trees cannot heal; they make no repairs. Instead, they defend themselves from the consequences of injury and infection by walling off the damage. At the same time they put new cells in new positions; in effect, they grow a new tree over the old one every year. The most obvious results of the process are growth rings, which are visible on the cross section of a trunk, a root, or a branch.
The author's main purpose in this article is to explain the______.
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