单项选择题

A．The visiting economist has given several lectures.
B．The guest lecturer’s opinion is different from Dr. Johnson’s.
C．Dr. Johnson and the guest speaker were schoolmates.
D．Dr. Johnson invited the economist to visit their college.
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单项选择题
A．Husband and wife.B．A girl and her boyfriend.C．Colleagues.D．Friends.
A．Husband and wife.
B．A girl and her boyfriend.
C．Colleagues.
D．Friends.
单项选择题
A．The lab-on-a-chip device would be very weakly repelled by magnets.B．They would make progress in both magnetic and electric fields.C．There would be more room for the development of future research.D．The team would manage to move even red blood cells and bacteria.
A．The lab-on-a-chip device would be very weakly repelled by magnets.
B．They would make progress in both magnetic and electric fields.
C．There would be more room for the development of future research.
D．The team would manage to move even red blood cells and bacteria.
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