填空题

To solve the size problem of cell phones, scientists have been researching ______ for decades.

【参考答案】

speech-recognition systems
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单项选择题
A．The tickets will sell out quickly.B．There will be extra tickets at the rock concert.C．The rock concert will probably be rescheduled.D．Each person will be allowed to buy only one ticket.
A．The tickets will sell out quickly.
B．There will be extra tickets at the rock concert.
C．The rock concert will probably be rescheduled.
D．Each person will be allowed to buy only one ticket.
填空题
Laptops equipped with ______ can allow their owners to temporarily deal with office work in some public places.
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