The field of artificial （）is a new branch of computer science.

Train conductor：Excuse me，mama.Ticket，please.Passenger：Sorry.I left it in the smoking section and I’ll go fetch it.Train conductor：It’s OK，lady.（）.

A．Take your time
B．Take your seat
C．You can go now
D．As you please

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76（）

A． within
B． at
C． through
D． to

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