Questions 23 to 26 are based on the conversation you have just heard.

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A．Talk the drug user out of the habit.
B．Stop thinking about the matter.
C．Keep his distance from drug addicts.
D．Be more friendly to his schoolmate.

A．A scarcity of jobs in their field.
B．Inadequate training in methods of biological research.
C．Difficulties in classifying all of the varieties of owls.
D．A lack of funding for their work with endangered species.