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.
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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.
单项选择题
A．The man doesn’’t have to study a foreign language.B．The man just passed the foreign language test.C．The man’’s advisor gave him some good advice.D．The man doesn’’t have to take the final exam.
A．The man doesn’’t have to study a foreign language.
B．The man just passed the foreign language test.
C．The man’’s advisor gave him some good advice.
D．The man doesn’’t have to take the final exam.
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