单项选择题

When are the visitors arriving（）

A.Ten o’clock.
B.Half past ten.
C.Eleven o’clock.

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单项选择题

A．Right
B．Wrong
C．Doesn’t say

单项选择题

A．it costs less than a human operative.
B．the information it stores is valuable.
C．they know that their data is saf

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