资产组合的方差由各资产的权重和方差决定，与各资产之间的协方差无关。()

未分类题By mentioning the encouragement of peoples saving, the author intends to______.A．emphasize the importance for people to be farsightedB．demonstrate the behavioral economics' influence on policy makingC．explain how behavioral economists earned the Nobel PrizeD．manifest that evolution has taking place in microeconomics

未分类题The underlined word in Paragraph 1 means______.A．lostB．prosperousC．fadingD．professional

未分类题According to the passage, a standard economic experience is that______.A．deficit finance is of value in economic crisisB．the stock market is in an irrational exuberanceC．markets may fail under some circumstancesD．humans are rational calculators

未分类题What do we learn from the text?A．Information technology is important for the transportation industry.B．The transportation industry has completed the task of using information technology to improve critical systems.C．Many people fail to realize the importance of the transportation industry.D．Many people fail to realize the importance of information technology.

未分类题The example of Britain indicates that______.A．a large proportion of waste is generated by developed countriesB．there are many other kinds of rubbish besides municipal wasteC．mining extraction generates large quantity of wasteD．agricultural waste makes up a large proportion of the total