第八题，用名词性从句代替，谁会请速答好不
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2.It is unbelievable that most human beings will live until they are 200 by the 25th century.
3.It is not true that personal computers will disappear by 2020.
4.Is it possible that satellites will be detroyed by the sun in the next five years.
5.It is a little frightening that aliens from four different planetes will arrive on Earth in the next 20 years.
6.It is convenient that we don't use money to buy food in the future.
3.It is not true that personal computers will disappear by 2020.
4.Is it possible that satellites will be detroyed by the sun in the next five years.
5.It is a little frightening that aliens from four different planetes will arrive on Earth in the next 20 years.
6.It is convenient that we don't use money to buy food in the future.
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