单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

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．He sent surgeons to serve in the army.B．He provided soldiers with medical supplies.C．He recruited volunteers to care for the wounded.D．He helped to free the prisoners of war.
A．He sent surgeons to serve in the army.
B．He provided soldiers with medical supplies.
C．He recruited volunteers to care for the wounded.
D．He helped to free the prisoners of war.
单项选择题
A．By prediction.B．By recording.C．Through observation.D．Through interviewing.
A．By prediction.
B．By recording.
C．Through observation.
D．Through interviewing.
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