题目

Computer programmer David Jones earns ￡35,000 a year designing new computer games, yet he cannot find a bank ready to let him have a credit card (信用卡). 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, where the problem of most young people of his age is finding a job. David’s firm releases (推出) two new games for the fast throwing 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 (抵押贷款下列物质长期暴露在空气中，质量会减轻的是（ ）A．浓硫酸B．浓盐酸C．氢氧化钠D．固体食盐