单项选择题
What is the possible relationship of these two speakers
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A．Doctor and patient.
B．Teacher and student.
C．Two friends.
D．Two scientists.
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单项选择题
According to Paragraph 1, what has happened in Mauritania
A．The Sahara has spread until it reached Mauritania"s capital.
B．Mauritania has moved its capital to the Sahara.
C．It takes a long time to walk through the Sahara.
D．People in Mauritania like the desert.
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