单项选择题

A．A system which trains doctors.
B．A group of experts who can provide professional advice.
C．A computer program which can provide professional advice.
D．A system which trains computer experts.
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单项选择题
A．The traffic.B．The weather.C．Their health.D．Their time - table.
A．The traffic.
B．The weather.
C．Their health.
D．Their time - table.
单项选择题
A．He had lost the tickets for the theater.B．He had lost his briefcase.C．He had left his briefcase at home.D．He had left the ticket in the office.
A．He had lost the tickets for the theater.
B．He had lost his briefcase.
C．He had left his briefcase at home.
D．He had left the ticket in the office.
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