The next time you try for a high-ranking post，you could let your possible boss listen to a recommen-ding（推荐）phone call "made" by US President George W． Bush or British Prime Minister Tony Blair．Of course， neither of them could really do that for you——you would just "borrow" their voices．AT & T labs will start selling speech software that it says is so good at reproducing the sounds of ahuman voice that it can recreate voices and even bring the voices of long-dead famous people back to life．The software， which turns printed text into speech， makes it possible for a company to userecordings of a person" s voice to say things that the person never actually said．
Possible customers for the software， which is priced in the thousands of dollars， includes tele-phone call centers，companies that make software that reads digital（数字的） files aloud，and makers~"~ ，~
of automated voice devices（装置）．The advances raise several problems． Who， for example， owns therights to a famous person" s voice? Some experts even believe that new contracts （合同） will bedrawn that include voice-licensing clauses．
And although scientists say the technology is not yet good enough to commit fraud （假冒），would the synthesized（合成的）voices at last be able to trick people into thinking that they weregetting phone calls or digital audio recordings from people they know?
Even Mr． Fruchterman， one of AT & T labs" possible first customers， said he wondered what thenew technology might bring． "Just like you can"t trust a photograph any more． " he said，" you won"tbe able to trust a voice either． "
A professor"s teaching method is another factor（因素） that determines the degree and ，type ofstudent participation． Some professors prefer to control discussion while others prefer to guide theclass without controlling it． Many professors encourage stud
In the teaching of science and mathematics， the controlling mode of instruction is generally， tra-ditional， with teachers presenting formal lectures and students taking notes． However， new educationaltrends have turned up in the humanities and social
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