单项选择题

A．Less than one year.
B．Five years.
C．Four years.
D．Ten years.
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单项选择题
A．He worked for a medical periodical.B．He published a paper about computer science.C．He suggested a link between smoke and lung cancer.D．He opened a hospital with his partner.
A．He worked for a medical periodical.
B．He published a paper about computer science.
C．He suggested a link between smoke and lung cancer.
D．He opened a hospital with his partner.
单项选择题
A．A city guide.B．A librarian.C．A computer expert.D．A registrar.
A．A city guide.
B．A librarian.
C．A computer expert.
D．A registrar.
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