单项选择题

A．Make sure there is no misunderstanding.
B．Try to persuade by giving various reasons.
C．Repeat the same reasons.
D．Listen carefully and patiently to the other party.
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单项选择题
A．It lasted until the Middle Ages.B．It lasted until the early 18th century.C．It lasted until the early 19th century.D．It lasted until the late 16th century.
A．It lasted until the Middle Ages.
B．It lasted until the early 18th century.
C．It lasted until the early 19th century.
D．It lasted until the late 16th century.
单项选择题
A．They have difficulty identifying these cells.B．They aren’’t sure how these cells work.C．They’’ve learned how to reproduce these cells.D．They’’ve found similar cells in other species.
A．They have difficulty identifying these cells.
B．They aren’’t sure how these cells work.
C．They’’ve learned how to reproduce these cells.
D．They’’ve found similar cells in other species.
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