生活中常用瓷碗炖食物，碗与锅底不直接接触，如图所示，当锅里的水沸腾后，碗里的汤一定（  ）

    China has been the birthplace of many of the world's greatest inventions. It was, for example, the first country to produce paper money. Before the invention of paper money and coins, people used many different kinds of things for buying and selling. ____ This exchange of goods and services for other goods and services is called bartering（物物交换）.

    ____ In 1200 BC, people in China began to use shells as money. Usually the shells used as money were very small. This made it easier for people to carry money over long distances, and allowed for trade to develop between different parts of the country.

    In the years which followed this invention, many other countries around the world began to do the same. ____

    The next development was in 1000 BC, when China started making bronze and copper shells. It wasn't long before the Chinese made round coins out of metal. ____ By 500 BC, metal coins had begun to appear in countries like Persia and Greece, and later in the Roman Empire.

    About 1000 years later, leather was used as money in China, and in 806 AD, the first paper banknotes were produced by the Chinese people. ____

A. As time went by, trade between countries increased.

B. People also began collecting foreign coins as souvenirs.

C. They also used tiny shells as money for buying and selling.

D. It was still many years before paper money appeared in Europe.

E. However, as economies developed, such exchanges became impractical.

F. During that time, for example, buying a chicken might cost several potatoes.

G. The very first coins often had holes in them so that people could tie them together.

下列关于有机化合物的叙述不正确的是（　　）

    With the development of science and technology, new inventions, especially new electronic products, have made people's lives easy and convenient. But as the saying puts: A coin has two sides.

    One day, I was walking in the park with a friend and his cell phone rang, interrupting our conversation. There we were, walking and talking on a beautiful sunny day and…I became invisible, absent from the conversation.

    The telephone used to connect you to the absent. Now it makes people sitting next to you feel absent. Why is it that the more connected we get, the more disconnected I feel? Every advance in communications technology is a tragedy to the closeness of human interaction. With email and instant messaging over the Internet, we can now communicate without seeing or talking to one another. With voice mail, you can conduct entire conversations without ever reaching anyone. If my mom has a question, I just leave the answer on her machine.

    As almost every contact we can imagine between human beings gets automated, the alienation(疏远) index goes up. You can't even call a person to get the phone number of another person any more. Directory assistance is almost always fully automated.

    Pumping petrol at the station? Why say good morning to the attendant when you can swipe(刷)your credit card at the pump and save yourself the bother of human contact?

    Making a deposit at the bank? Why talk to a teller who might live in the neighborhood when you can just insert your card into ATM?

    Pretty soon you won't have the burden of making eye contact at the grocery shop. Some supermarket chains are using a self-scanner so you can check yourself out, avoiding those check-out people who look at you and ask how you are doing.

    I am not against modern technology. I own a cell phone, an ATM card, a voice mail system, and an email account. Giving them up isn't wise…they're a great help to us. It's some of their possible consequences that make me feel uneasy.

    More and more, I find myself hiding behind e-mail to do a job meant for conversation. Or being relieved that voice mail picked up a call because I didn't really have time to talk. The communications industry devoted to helping me keep in touch is making me lonelier.

    So I've put myself on technology restriction: no instant messaging, with people who live near me，no cell phoning in the presence of friends, no letting the voice mail pick up when I'm at home.