| People use money to buy food, books,
bicycles and hundreds of other things they need. When they work, they usually
get paid in money. Most of the money used today is made of metal or paper. But in ancient times people used to use all kinds of things as money. One of the first kinds of money was shells. In China, cloth and knives were used as money. Elephant tusks, monkey tails and salt were used in some parts of Africa. Rice was also a kind of money used by the ancient people in some islands. Cows and other animals were used as money, too. The first copper coins were made in China. They were round and had a square hole in the centre. Different counties had used different metals for their money. Later some countries began to make Coins of gold and silver. But gold and silver were heavy to carry when people need a lot of A. they were too heavy B. they would be for future use C. they were easy to slip off D. they were useless [单项选择]
Warm People Likely to Keep Cold at Bay Staying positive through the cold season could be your best defense against getting ill, new study findings suggest. In an experiment that exposed healthy volunteers to a cold or flu virus, researchers found that people with a generally sunny disposition were less likely to fall ill. The findings, published in the journal Psychosomatic Medicine, build on evidence that a "positive emotional style" can help ward off the common cold and other illnesses. Researchers believe the reasons may be both objective as in happiness boosting immune function and subjective as in happy people being less troubled by a scratchy throat or runny nose. "People with a positive emotional style may have different immune responses to the virus," explained lead study author Dr Sheldon Cohen of Carnegie Mellon University in Pittsburgh. "And when they do get a cold, they may interpret their illness as being less sever A. happy B. selfish C. easy-going D. energetic 我来回答: 提交
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