单项选择题

A．Getting rich quickly.
B．Distinguishing oneself.
C．Respecting individual rights.
D．Doing credit to one’’s community.
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单项选择题
A．It helps improve their safety.B．It allows them to swim faster.C．It helps them fight their predators.D．It allows them to avoid twists and turns.
A．It helps improve their safety.
B．It allows them to swim faster.
C．It helps them fight their predators.
D．It allows them to avoid twists and turns.
单项选择题
According to the author, clinical trials of vitamin supplements ________.
A．often result in misleading conclusions
B．take time and will not produce conclusive results
C．should be conducted by scientists on a larger scale
D．appear to be a sheer waste of time and resources
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