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开放型基金买卖价格取决于市场供求关系。()
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下列有关某特定投资组合β系数的表述错误的是（)。A．当投资组合的β=1时，表现该投资组合的风险为零下列有关某特定投资组合β系数的表述错误的是()。
Almost Human？
Scientists are racing to build the world's first thinking robot. This is not science fiction: some say they will have made it by the year 2020. Carol Packer reports.
Machines that walk, speak and feel are no longer science fiction. Kismet is the name of an android (机器人) which scientists have built at the Massachusetts institute of Technology (MIT). Kismet is different from the traditional robot because it can show human emotions. Its eyes, ears and lips move to show when it feels happy, sad or bored. Kismet is one of the first of a new generation of androids -- robots that look like human beings -- which can imitate human feelings. Cog, another android invented by the MIT, imitates the action of a mother. However, scientists admit that so far Cog has the mental ability of a two-year-old.
The optimists (乐观主义者) say that by the year 2020 we will have created humanoids (机器人) with brains similar to those of an adult human being. These robots will be designed to look like people to make them more attractive and easier to sell to the public. What kind of jobs will they do？ In the future, robots like Robonaut, a humanoid invented by NASA, will be doing dangerous jobs, like repairing space stations. They will also be doing more and more of the household work for us. In Japan, scientists are designing androids that will entertain us by dancing and playing the piano.
Some people worry about what the future holds: Will robots become monsters (怪物)？ Will people themselves become increasingly like robots？ Experts predict that more and more people will be wearing micro-computers, connected to the Internet in the future. People will have micro-chips in various parts of their body, which will connect them to a wide variety of gadgets (小装置). Perhaps we should not exaggerate (夸大) the importance of technology, but one wonders whether, in years to come, we will still be falling in love, and whether we will still feel pain. Who knows？
Kismet is different from traditional robots because
Saving Money
Where you save your money often depends on what you are saving for. If you are saving to buy a CD (光盘) or to go to a concert, then probably you would keep your money somewhere in your room.
If you are saving for a big purchase like a mountain bike or a school trip, where would you save your money？
One place to save money is the bank. Putting your money in a savings account will help your money earn more money. If you put your money in a piggy bank (猪形储蓄罐), one year later you'll still have the same amount of money you put in. If you put your money in a savings account, one year later, you'll have more money than you put in. Why？
When you keep your money in a bank, your money earns interest. Interest is an amount of money a bank pays you to use your money. The bank uses your money (and the money of other people, too) to loan money to people and businesses.
The bank will send you a statement several times a year. A bank statement tells you how much money you have in your account. It also tells you how much interest you have earned. If you leave your money in the bank, you can watch it growl
Another way you can save money is to buy a certificate of deposit or CD. If you have some money that you don't need to use for a long time, this is a good way to make your money grow.
You can buy a CD at a bank. You agree not to use the money for a certain period of time. That period might be from six months to five years. You can't touch your money during that time. If you do, you must pay a penalty, or fee.
Your money will earn more money if you put it
Migrant (移民的) Workers
In the past twenty years, there has been an increasing tendency for workers to move from one country to another. While some countries have restricted (限制) most(51) to local people, others have attracted and welcomed migrant workers. This is particularly the case in the Middle East,(52) increased oil incomes have enabled many countries to call in outsiders to improve local facilities (设施). Thus the Middle East has attracted oil-workers(53) the U.S.A. and Europe. It has also brought in workers from many other countries,(54) South Korea and Japan.
In view of the difficult living and working(55) in the Middle East, it is not surprising that the pay is high to attract suitable workers. Many engineers and technicians can(56) at least twice as much money in the Middle East as they can in their own country, and this is a major(57).
Sometimes a disadvantage has a compensating (补尝的) advantage. For example, the(58) living conditions often lead to increased friendshipwhen workers have to(59) on each other for safety and comfort. In a similar way, many migrant workers can save large sums of money partly because of the(69) of entertainment (娱乐) facilities. The work is often complex and full of problems but this merely presents greater challenge to engineers who prefer to find solutions to problems rather than do(61) work in their home country.
One major problem which(62) migrant workers in the Middle East is that their jobs are temporary ones. They are nearly always on(63), so it is not easy for them to plan ahead with great confidence. This is to be(64) since no country welcomes a large number of foreign workers as permanent residents. In any(65), migrant Workers accept this disadvantage, along with others, because of the considerable financial benefits which they receive.
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