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.
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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
单项选择题
A．Alan thought Sally was too hard on Alex.B．Alan liked Alex very much and would write him a very good reference.C．Alan would turn down Alex’’s request.D．Alan could see something good even in a very bad person.
A．Alan thought Sally was too hard on Alex.
B．Alan liked Alex very much and would write him a very good reference.
C．Alan would turn down Alex’’s request.
D．Alan could see something good even in a very bad person.
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