单项选择题

Questions 22 to 25 are based on the conversation you have just heard.

A．doctor and nurse.
B．Librarian and library patron.
C．Forest ranger and hiker.
D．Nurse and patient.
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单项选择题
A．Because we have made up our minds to do so.B．Because we want to fulfill our desire for knowledge.C．Because we want to enjoy the ecstasy of achievement.D．Because we cannot help ourselves.
A．Because we have made up our minds to do so.
B．Because we want to fulfill our desire for knowledge.
C．Because we want to enjoy the ecstasy of achievement.
D．Because we cannot help ourselves.
单项选择题
A．Pollution problem.B．Population problem.C．Unemployment problem.D．Nuclear weapon problem.
A．Pollution problem.
B．Population problem.
C．Unemployment problem.
D．Nuclear weapon problem.
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