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生理情况下，牙齿发育完成以后形成的 牙本质是
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Computer programmer David earns $40,000 a year designing new computer games, yet he cannot find a bank to let him have a credit card. Instead, he has been told to wait another two years until he is 18. The 16-year-old works for a-small firm in Liverpool. David’s firm releases two new games for the fast growing computer market each month. But David’s biggest headache is what to do with his money. Even though he earns a lot, he cannot drive a car, take out a mortgage(抵押货款), or get credit cards. "I got the job because the people who run the firm knew I had already written some programs." he said. David spends some of his money on records and clothes, and gives his mother 50 pounds a week. "Unfortunately, computing was not part of our studies at school," he said, "but I had been studying it in books and magazines for four years in my spare time. I knew what I wanted to do and never considered staying on at school." David added, "I would like to earn a million and I suppose early retirement is a possibility. You never know when the market might disappear.\ What is one of the problems that David is facing now
There are stock markets(股票市场) in large cities in many countries. The stock exchange is a place where people can buy or sell shares of a factory or company. And each share means certain ownership of a factory or company. Different people go to stock markets. Some are rich, who want to get more money than they have. Others are not very rich, who buy stocks to try to become rich. Still others buy stocks as part of their plan to save money. Of course, investing(投资) money in the stock market is not the safest way to make money. No one can tell exactly whether the shares will be doing well. The factory or company may do badly. Then the stocks will go down, and the investors will lose money. The stock may go up or down for a number of untold reasons. Everyone wants the stock to go up, but sometimes even if a factory or company does a good job, the stock may still go down. No wonder going to the stock market is often compared to gambling (赌博). Factories and companies that need money are pleased that so many people are willing to "gamble". Indeed, the stock market is an attractive and complex part of the business world. Rich people never go to the stock market, do they
下列语句序列执行后，k的值是 ( ) public class c9{ public static void main(String[]args){ int a＝10，b＝18，c＝30； switch(b%A) { case 7：c--；break case 8：c-＝2；break； case 9：c-＝3；break； default : c * ＝b；break； } System．out．println(C) ； } }
听第7段材料，回答第8～10题。 How does the woman feel in the conversation
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