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单项选择题

A．To show how simple the mechanical aids for diving can be.
B．To provide an excuse for his changeable character.
C．To explore the philosophical issues of space travel.
D．To explain why he took up underwater exploration.
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单项选择题The students’’ criteria for selecting majors today have much to do with________.

A．the influences of their instructors
B．the financial goals they seek in life
C．their own interpretations of the courses
D．their understanding of the contributions of others

单项选择题A．Teachers and librarians.B．Teachers.C．Specialists.D．Educators.

A．Teachers and librarians.
B．Teachers.
C．Specialists.
D．Educators.